Re: sound: use-after-free in snd_seq_cell_alloc
On Thu, 23 Mar 2017 13:23:03 +0100, Dmitry Vyukov wrote: > > Hello, > > I've got the following report while running syzkaller fuzzer on > 093b995e3b55a0ae0670226ddfcb05bfbf0099ae. Unfortunately this is not > reproducible so far. > > == > BUG: KASAN: use-after-free in __lock_acquire+0x39df/0x3a80 > kernel/locking/lockdep.c:3230 at addr 8800495fb6a0 > Read of size 8 by task syz-executor7/17253 > CPU: 2 PID: 17253 Comm: syz-executor7 Not tainted 4.11.0-rc3+ #364 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:337 > __lock_acquire+0x39df/0x3a80 kernel/locking/lockdep.c:3230 > lock_acquire+0x1ee/0x590 kernel/locking/lockdep.c:3762 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0x9f/0xd0 kernel/locking/spinlock.c:159 > snd_seq_cell_alloc.isra.1+0x17d/0x6a0 sound/core/seq/seq_memory.c:238 > snd_seq_event_dup+0x15d/0xa00 sound/core/seq/seq_memory.c:309 > snd_seq_fifo_event_in+0xe3/0x420 sound/core/seq/seq_fifo.c:128 > snd_seq_deliver_single_event.constprop.12+0x814/0x980 > sound/core/seq/seq_clientmgr.c:615 > snd_seq_deliver_event+0x12c/0x720 sound/core/seq/seq_clientmgr.c:818 > snd_seq_kernel_client_dispatch+0x131/0x160 > sound/core/seq/seq_clientmgr.c:2319 > snd_seq_system_notify+0x11b/0x160 sound/core/seq/seq_system.c:112 > snd_seq_client_notify_subscription+0x16f/0x210 > sound/core/seq/seq_clientmgr.c:1414 > subscribe_port sound/core/seq/seq_ports.c:434 [inline] > check_and_subscribe_port+0x725/0x950 sound/core/seq/seq_ports.c:510 > snd_seq_port_connect+0x3e5/0x700 sound/core/seq/seq_ports.c:579 > snd_seq_ioctl_subscribe_port+0x24b/0x300 sound/core/seq/seq_clientmgr.c:1443 > snd_seq_kernel_client_ctl+0x122/0x160 sound/core/seq/seq_clientmgr.c:2350 > snd_seq_oss_midi_open+0x640/0x850 sound/core/seq/oss/seq_oss_midi.c:375 > snd_seq_oss_synth_setup_midi+0x109/0x4d0 > sound/core/seq/oss/seq_oss_synth.c:281 > snd_seq_oss_open+0x70f/0x8b0 sound/core/seq/oss/seq_oss_init.c:274 > odev_open+0x6a/0x90 sound/core/seq/oss/seq_oss.c:138 > soundcore_open+0x321/0x630 sound/sound_core.c:639 > chrdev_open+0x257/0x730 fs/char_dev.c:392 > do_dentry_open+0x710/0xc80 fs/open.c:751 > vfs_open+0x105/0x220 fs/open.c:864 > do_last fs/namei.c:3349 [inline] > path_openat+0x1151/0x35b0 fs/namei.c:3490 > do_filp_open+0x249/0x370 fs/namei.c:3525 > do_sys_open+0x502/0x6d0 fs/open.c:1051 > SYSC_openat fs/open.c:1078 [inline] > SyS_openat+0x30/0x40 fs/open.c:1072 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x445b79 > RSP: 002b:7f02452a6858 EFLAGS: 0292 ORIG_RAX: 0101 > RAX: ffda RBX: 00708000 RCX: 00445b79 > RDX: RSI: 20063ff0 RDI: ff9c > RBP: 0086 R08: R09: > R10: R11: 0292 R12: 006e0fe0 > R13: 1000 R14: 0003 R15: 2000 > Object at 8800495fb600, in cache kmalloc-192 size: 192 > Allocated: > PID = 17260 > kmalloc include/linux/slab.h:490 [inline] > kzalloc include/linux/slab.h:663 [inline] > snd_seq_pool_new+0x93/0x2f0 sound/core/seq/seq_memory.c:470 > snd_seq_fifo_new+0xc3/0x360 sound/core/seq/seq_fifo.c:41 > snd_seq_open+0x404/0x520 sound/core/seq/seq_clientmgr.c:333 > snd_open+0x1fa/0x3f0 sound/core/sound.c:177 > chrdev_open+0x257/0x730 fs/char_dev.c:392 > do_dentry_open+0x710/0xc80 fs/open.c:751 > vfs_open+0x105/0x220 fs/open.c:864 > do_last fs/namei.c:3349 [inline] > path_openat+0x1151/0x35b0 fs/namei.c:3490 > do_filp_open+0x249/0x370 fs/namei.c:3525 > do_sys_open+0x502/0x6d0 fs/open.c:1051 > SYSC_open fs/open.c:1069 [inline] > SyS_open+0x2d/0x40 fs/open.c:1064 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > Freed: > PID = 17280 > kfree+0xd7/0x250 mm/slab.c:3831 > snd_seq_pool_delete+0x52/0x70 sound/core/seq/seq_memory.c:498 > snd_seq_fifo_resize+0x263/0x3e0 sound/core/seq/seq_fifo.c:275 > snd_seq_ioctl_set_client_pool+0x481/0x600 sound/core/seq/seq_clientmgr.c:1849 > snd_seq_ioctl+0x204/0x470 sound/core/seq/seq_clientmgr.c:2131 > vfs_ioctl fs/ioctl.c:45 [inline] > do_vfs_ioctl+0x1af/0x16d0 fs/ioctl.c:685 > SYSC_ioctl fs/ioctl.c:700 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > Memory state around the buggy address: > 8800495fb580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > 8800495fb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > >8800495fb680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >^ > 8800495fb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > 8800495fb780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > == Thanks for the report. This is likely a race at FIFO
Re: sound: use-after-free in snd_seq_cell_alloc
On Thu, 23 Mar 2017 13:23:03 +0100, Dmitry Vyukov wrote: > > Hello, > > I've got the following report while running syzkaller fuzzer on > 093b995e3b55a0ae0670226ddfcb05bfbf0099ae. Unfortunately this is not > reproducible so far. > > == > BUG: KASAN: use-after-free in __lock_acquire+0x39df/0x3a80 > kernel/locking/lockdep.c:3230 at addr 8800495fb6a0 > Read of size 8 by task syz-executor7/17253 > CPU: 2 PID: 17253 Comm: syz-executor7 Not tainted 4.11.0-rc3+ #364 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:337 > __lock_acquire+0x39df/0x3a80 kernel/locking/lockdep.c:3230 > lock_acquire+0x1ee/0x590 kernel/locking/lockdep.c:3762 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0x9f/0xd0 kernel/locking/spinlock.c:159 > snd_seq_cell_alloc.isra.1+0x17d/0x6a0 sound/core/seq/seq_memory.c:238 > snd_seq_event_dup+0x15d/0xa00 sound/core/seq/seq_memory.c:309 > snd_seq_fifo_event_in+0xe3/0x420 sound/core/seq/seq_fifo.c:128 > snd_seq_deliver_single_event.constprop.12+0x814/0x980 > sound/core/seq/seq_clientmgr.c:615 > snd_seq_deliver_event+0x12c/0x720 sound/core/seq/seq_clientmgr.c:818 > snd_seq_kernel_client_dispatch+0x131/0x160 > sound/core/seq/seq_clientmgr.c:2319 > snd_seq_system_notify+0x11b/0x160 sound/core/seq/seq_system.c:112 > snd_seq_client_notify_subscription+0x16f/0x210 > sound/core/seq/seq_clientmgr.c:1414 > subscribe_port sound/core/seq/seq_ports.c:434 [inline] > check_and_subscribe_port+0x725/0x950 sound/core/seq/seq_ports.c:510 > snd_seq_port_connect+0x3e5/0x700 sound/core/seq/seq_ports.c:579 > snd_seq_ioctl_subscribe_port+0x24b/0x300 sound/core/seq/seq_clientmgr.c:1443 > snd_seq_kernel_client_ctl+0x122/0x160 sound/core/seq/seq_clientmgr.c:2350 > snd_seq_oss_midi_open+0x640/0x850 sound/core/seq/oss/seq_oss_midi.c:375 > snd_seq_oss_synth_setup_midi+0x109/0x4d0 > sound/core/seq/oss/seq_oss_synth.c:281 > snd_seq_oss_open+0x70f/0x8b0 sound/core/seq/oss/seq_oss_init.c:274 > odev_open+0x6a/0x90 sound/core/seq/oss/seq_oss.c:138 > soundcore_open+0x321/0x630 sound/sound_core.c:639 > chrdev_open+0x257/0x730 fs/char_dev.c:392 > do_dentry_open+0x710/0xc80 fs/open.c:751 > vfs_open+0x105/0x220 fs/open.c:864 > do_last fs/namei.c:3349 [inline] > path_openat+0x1151/0x35b0 fs/namei.c:3490 > do_filp_open+0x249/0x370 fs/namei.c:3525 > do_sys_open+0x502/0x6d0 fs/open.c:1051 > SYSC_openat fs/open.c:1078 [inline] > SyS_openat+0x30/0x40 fs/open.c:1072 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x445b79 > RSP: 002b:7f02452a6858 EFLAGS: 0292 ORIG_RAX: 0101 > RAX: ffda RBX: 00708000 RCX: 00445b79 > RDX: RSI: 20063ff0 RDI: ff9c > RBP: 0086 R08: R09: > R10: R11: 0292 R12: 006e0fe0 > R13: 1000 R14: 0003 R15: 2000 > Object at 8800495fb600, in cache kmalloc-192 size: 192 > Allocated: > PID = 17260 > kmalloc include/linux/slab.h:490 [inline] > kzalloc include/linux/slab.h:663 [inline] > snd_seq_pool_new+0x93/0x2f0 sound/core/seq/seq_memory.c:470 > snd_seq_fifo_new+0xc3/0x360 sound/core/seq/seq_fifo.c:41 > snd_seq_open+0x404/0x520 sound/core/seq/seq_clientmgr.c:333 > snd_open+0x1fa/0x3f0 sound/core/sound.c:177 > chrdev_open+0x257/0x730 fs/char_dev.c:392 > do_dentry_open+0x710/0xc80 fs/open.c:751 > vfs_open+0x105/0x220 fs/open.c:864 > do_last fs/namei.c:3349 [inline] > path_openat+0x1151/0x35b0 fs/namei.c:3490 > do_filp_open+0x249/0x370 fs/namei.c:3525 > do_sys_open+0x502/0x6d0 fs/open.c:1051 > SYSC_open fs/open.c:1069 [inline] > SyS_open+0x2d/0x40 fs/open.c:1064 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > Freed: > PID = 17280 > kfree+0xd7/0x250 mm/slab.c:3831 > snd_seq_pool_delete+0x52/0x70 sound/core/seq/seq_memory.c:498 > snd_seq_fifo_resize+0x263/0x3e0 sound/core/seq/seq_fifo.c:275 > snd_seq_ioctl_set_client_pool+0x481/0x600 sound/core/seq/seq_clientmgr.c:1849 > snd_seq_ioctl+0x204/0x470 sound/core/seq/seq_clientmgr.c:2131 > vfs_ioctl fs/ioctl.c:45 [inline] > do_vfs_ioctl+0x1af/0x16d0 fs/ioctl.c:685 > SYSC_ioctl fs/ioctl.c:700 [inline] > SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > Memory state around the buggy address: > 8800495fb580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > 8800495fb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > >8800495fb680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >^ > 8800495fb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > 8800495fb780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > == Thanks for the report. This is likely a race at FIFO
sound: use-after-free in snd_seq_cell_alloc
Hello, I've got the following report while running syzkaller fuzzer on 093b995e3b55a0ae0670226ddfcb05bfbf0099ae. Unfortunately this is not reproducible so far. == BUG: KASAN: use-after-free in __lock_acquire+0x39df/0x3a80 kernel/locking/lockdep.c:3230 at addr 8800495fb6a0 Read of size 8 by task syz-executor7/17253 CPU: 2 PID: 17253 Comm: syz-executor7 Not tainted 4.11.0-rc3+ #364 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:337 __lock_acquire+0x39df/0x3a80 kernel/locking/lockdep.c:3230 lock_acquire+0x1ee/0x590 kernel/locking/lockdep.c:3762 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x9f/0xd0 kernel/locking/spinlock.c:159 snd_seq_cell_alloc.isra.1+0x17d/0x6a0 sound/core/seq/seq_memory.c:238 snd_seq_event_dup+0x15d/0xa00 sound/core/seq/seq_memory.c:309 snd_seq_fifo_event_in+0xe3/0x420 sound/core/seq/seq_fifo.c:128 snd_seq_deliver_single_event.constprop.12+0x814/0x980 sound/core/seq/seq_clientmgr.c:615 snd_seq_deliver_event+0x12c/0x720 sound/core/seq/seq_clientmgr.c:818 snd_seq_kernel_client_dispatch+0x131/0x160 sound/core/seq/seq_clientmgr.c:2319 snd_seq_system_notify+0x11b/0x160 sound/core/seq/seq_system.c:112 snd_seq_client_notify_subscription+0x16f/0x210 sound/core/seq/seq_clientmgr.c:1414 subscribe_port sound/core/seq/seq_ports.c:434 [inline] check_and_subscribe_port+0x725/0x950 sound/core/seq/seq_ports.c:510 snd_seq_port_connect+0x3e5/0x700 sound/core/seq/seq_ports.c:579 snd_seq_ioctl_subscribe_port+0x24b/0x300 sound/core/seq/seq_clientmgr.c:1443 snd_seq_kernel_client_ctl+0x122/0x160 sound/core/seq/seq_clientmgr.c:2350 snd_seq_oss_midi_open+0x640/0x850 sound/core/seq/oss/seq_oss_midi.c:375 snd_seq_oss_synth_setup_midi+0x109/0x4d0 sound/core/seq/oss/seq_oss_synth.c:281 snd_seq_oss_open+0x70f/0x8b0 sound/core/seq/oss/seq_oss_init.c:274 odev_open+0x6a/0x90 sound/core/seq/oss/seq_oss.c:138 soundcore_open+0x321/0x630 sound/sound_core.c:639 chrdev_open+0x257/0x730 fs/char_dev.c:392 do_dentry_open+0x710/0xc80 fs/open.c:751 vfs_open+0x105/0x220 fs/open.c:864 do_last fs/namei.c:3349 [inline] path_openat+0x1151/0x35b0 fs/namei.c:3490 do_filp_open+0x249/0x370 fs/namei.c:3525 do_sys_open+0x502/0x6d0 fs/open.c:1051 SYSC_openat fs/open.c:1078 [inline] SyS_openat+0x30/0x40 fs/open.c:1072 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x445b79 RSP: 002b:7f02452a6858 EFLAGS: 0292 ORIG_RAX: 0101 RAX: ffda RBX: 00708000 RCX: 00445b79 RDX: RSI: 20063ff0 RDI: ff9c RBP: 0086 R08: R09: R10: R11: 0292 R12: 006e0fe0 R13: 1000 R14: 0003 R15: 2000 Object at 8800495fb600, in cache kmalloc-192 size: 192 Allocated: PID = 17260 kmalloc include/linux/slab.h:490 [inline] kzalloc include/linux/slab.h:663 [inline] snd_seq_pool_new+0x93/0x2f0 sound/core/seq/seq_memory.c:470 snd_seq_fifo_new+0xc3/0x360 sound/core/seq/seq_fifo.c:41 snd_seq_open+0x404/0x520 sound/core/seq/seq_clientmgr.c:333 snd_open+0x1fa/0x3f0 sound/core/sound.c:177 chrdev_open+0x257/0x730 fs/char_dev.c:392 do_dentry_open+0x710/0xc80 fs/open.c:751 vfs_open+0x105/0x220 fs/open.c:864 do_last fs/namei.c:3349 [inline] path_openat+0x1151/0x35b0 fs/namei.c:3490 do_filp_open+0x249/0x370 fs/namei.c:3525 do_sys_open+0x502/0x6d0 fs/open.c:1051 SYSC_open fs/open.c:1069 [inline] SyS_open+0x2d/0x40 fs/open.c:1064 entry_SYSCALL_64_fastpath+0x1f/0xc2 Freed: PID = 17280 kfree+0xd7/0x250 mm/slab.c:3831 snd_seq_pool_delete+0x52/0x70 sound/core/seq/seq_memory.c:498 snd_seq_fifo_resize+0x263/0x3e0 sound/core/seq/seq_fifo.c:275 snd_seq_ioctl_set_client_pool+0x481/0x600 sound/core/seq/seq_clientmgr.c:1849 snd_seq_ioctl+0x204/0x470 sound/core/seq/seq_clientmgr.c:2131 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1af/0x16d0 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xc2 Memory state around the buggy address: 8800495fb580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 8800495fb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >8800495fb680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ 8800495fb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 8800495fb780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==
sound: use-after-free in snd_seq_cell_alloc
Hello, I've got the following report while running syzkaller fuzzer on 093b995e3b55a0ae0670226ddfcb05bfbf0099ae. Unfortunately this is not reproducible so far. == BUG: KASAN: use-after-free in __lock_acquire+0x39df/0x3a80 kernel/locking/lockdep.c:3230 at addr 8800495fb6a0 Read of size 8 by task syz-executor7/17253 CPU: 2 PID: 17253 Comm: syz-executor7 Not tainted 4.11.0-rc3+ #364 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __asan_report_load8_noabort+0x29/0x30 mm/kasan/report.c:337 __lock_acquire+0x39df/0x3a80 kernel/locking/lockdep.c:3230 lock_acquire+0x1ee/0x590 kernel/locking/lockdep.c:3762 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x9f/0xd0 kernel/locking/spinlock.c:159 snd_seq_cell_alloc.isra.1+0x17d/0x6a0 sound/core/seq/seq_memory.c:238 snd_seq_event_dup+0x15d/0xa00 sound/core/seq/seq_memory.c:309 snd_seq_fifo_event_in+0xe3/0x420 sound/core/seq/seq_fifo.c:128 snd_seq_deliver_single_event.constprop.12+0x814/0x980 sound/core/seq/seq_clientmgr.c:615 snd_seq_deliver_event+0x12c/0x720 sound/core/seq/seq_clientmgr.c:818 snd_seq_kernel_client_dispatch+0x131/0x160 sound/core/seq/seq_clientmgr.c:2319 snd_seq_system_notify+0x11b/0x160 sound/core/seq/seq_system.c:112 snd_seq_client_notify_subscription+0x16f/0x210 sound/core/seq/seq_clientmgr.c:1414 subscribe_port sound/core/seq/seq_ports.c:434 [inline] check_and_subscribe_port+0x725/0x950 sound/core/seq/seq_ports.c:510 snd_seq_port_connect+0x3e5/0x700 sound/core/seq/seq_ports.c:579 snd_seq_ioctl_subscribe_port+0x24b/0x300 sound/core/seq/seq_clientmgr.c:1443 snd_seq_kernel_client_ctl+0x122/0x160 sound/core/seq/seq_clientmgr.c:2350 snd_seq_oss_midi_open+0x640/0x850 sound/core/seq/oss/seq_oss_midi.c:375 snd_seq_oss_synth_setup_midi+0x109/0x4d0 sound/core/seq/oss/seq_oss_synth.c:281 snd_seq_oss_open+0x70f/0x8b0 sound/core/seq/oss/seq_oss_init.c:274 odev_open+0x6a/0x90 sound/core/seq/oss/seq_oss.c:138 soundcore_open+0x321/0x630 sound/sound_core.c:639 chrdev_open+0x257/0x730 fs/char_dev.c:392 do_dentry_open+0x710/0xc80 fs/open.c:751 vfs_open+0x105/0x220 fs/open.c:864 do_last fs/namei.c:3349 [inline] path_openat+0x1151/0x35b0 fs/namei.c:3490 do_filp_open+0x249/0x370 fs/namei.c:3525 do_sys_open+0x502/0x6d0 fs/open.c:1051 SYSC_openat fs/open.c:1078 [inline] SyS_openat+0x30/0x40 fs/open.c:1072 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x445b79 RSP: 002b:7f02452a6858 EFLAGS: 0292 ORIG_RAX: 0101 RAX: ffda RBX: 00708000 RCX: 00445b79 RDX: RSI: 20063ff0 RDI: ff9c RBP: 0086 R08: R09: R10: R11: 0292 R12: 006e0fe0 R13: 1000 R14: 0003 R15: 2000 Object at 8800495fb600, in cache kmalloc-192 size: 192 Allocated: PID = 17260 kmalloc include/linux/slab.h:490 [inline] kzalloc include/linux/slab.h:663 [inline] snd_seq_pool_new+0x93/0x2f0 sound/core/seq/seq_memory.c:470 snd_seq_fifo_new+0xc3/0x360 sound/core/seq/seq_fifo.c:41 snd_seq_open+0x404/0x520 sound/core/seq/seq_clientmgr.c:333 snd_open+0x1fa/0x3f0 sound/core/sound.c:177 chrdev_open+0x257/0x730 fs/char_dev.c:392 do_dentry_open+0x710/0xc80 fs/open.c:751 vfs_open+0x105/0x220 fs/open.c:864 do_last fs/namei.c:3349 [inline] path_openat+0x1151/0x35b0 fs/namei.c:3490 do_filp_open+0x249/0x370 fs/namei.c:3525 do_sys_open+0x502/0x6d0 fs/open.c:1051 SYSC_open fs/open.c:1069 [inline] SyS_open+0x2d/0x40 fs/open.c:1064 entry_SYSCALL_64_fastpath+0x1f/0xc2 Freed: PID = 17280 kfree+0xd7/0x250 mm/slab.c:3831 snd_seq_pool_delete+0x52/0x70 sound/core/seq/seq_memory.c:498 snd_seq_fifo_resize+0x263/0x3e0 sound/core/seq/seq_fifo.c:275 snd_seq_ioctl_set_client_pool+0x481/0x600 sound/core/seq/seq_clientmgr.c:1849 snd_seq_ioctl+0x204/0x470 sound/core/seq/seq_clientmgr.c:2131 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1af/0x16d0 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xc2 Memory state around the buggy address: 8800495fb580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 8800495fb600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >8800495fb680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ 8800495fb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 8800495fb780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==
