Hi Takeshi, On Fri, Nov 28, 2025 at 06:24:43PM +0100, Takashi Iwai wrote: > On Fri, 28 Nov 2025 07:07:36 +0100, > Salvatore Bonaccorso wrote: > > > > Hi Jaroslav, hi Takashi > > > > A user in Debian reported (in https://bugs.debian.org/1121535) an > > array-index-out-of-bounds affecting ctxfi/ctamixer.c: > > > > On Fri, Nov 28, 2025 at 12:06:07AM +0100, waxhead wrote: > > > ------------[ cut here ]------------ > > > Nov 27 23:46:53 main kernel: UBSAN: array-index-out-of-bounds in > > > /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c:347:48 > > > Nov 27 23:46:53 main kernel: index 8 is out of range for type 'unsigned > > > char [8]' > > > Nov 27 23:46:53 main kernel: CPU: 4 UID: 0 PID: 468 Comm: (udev-worker) > > > Not tainted 6.17.8+deb14-amd64 #1 PREEMPT(lazy) Debian 6.17.8-1 > > > Nov 27 23:46:53 main kernel: Hardware name: FUJITSU /D3446-S2, BIOS > > > V5.0.0.12 R1.26.0 for D3446-S2x 02/11/2020 > > > Nov 27 23:46:53 main kernel: Call Trace: > > > Nov 27 23:46:53 main kernel: <TASK> > > > Nov 27 23:46:53 main kernel: dump_stack_lvl+0x5d/0x80 > > > Nov 27 23:46:53 main kernel: ? __pfx_amixer_set_x+0x10/0x10 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: ubsan_epilogue+0x5/0x2b > > > Nov 27 23:46:53 main kernel: __ubsan_handle_out_of_bounds.cold+0x54/0x59 > > > Nov 27 23:46:53 main kernel: sum_output_slot+0x44/0x70 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: amixer_set_input+0x4b/0x80 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: amixer_setup+0x1b/0x50 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: ct_mixer_create+0x193/0x570 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: ct_atc_create+0x3cb/0x530 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: ct_card_probe+0x104/0x2c0 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: local_pci_probe+0x3f/0x90 > > > Nov 27 23:46:53 main kernel: pci_device_probe+0xda/0x2b0 > > > Nov 27 23:46:53 main kernel: ? sysfs_do_create_link_sd+0x6d/0xd0 > > > Nov 27 23:46:53 main kernel: really_probe+0xdb/0x340 > > > Nov 27 23:46:53 main kernel: ? pm_runtime_barrier+0x55/0x90 > > > Nov 27 23:46:53 main kernel: __driver_probe_device+0x78/0x140 > > > Nov 27 23:46:53 main kernel: driver_probe_device+0x1f/0xa0 > > > Nov 27 23:46:53 main kernel: ? __pfx___driver_attach+0x10/0x10 > > > Nov 27 23:46:53 main kernel: __driver_attach+0xcb/0x1e0 > > > Nov 27 23:46:53 main kernel: bus_for_each_dev+0x82/0xd0 > > > Nov 27 23:46:53 main kernel: bus_add_driver+0x10b/0x1f0 > > > Nov 27 23:46:53 main kernel: ? __pfx_ct_driver_init+0x10/0x10 [snd_ctxfi] > > > Nov 27 23:46:53 main kernel: driver_register+0x75/0xe0 > > > Nov 27 23:46:53 main kernel: do_one_initcall+0x58/0x300 > > > Nov 27 23:46:53 main kernel: do_init_module+0x62/0x250 > > > Nov 27 23:46:53 main kernel: ? init_module_from_file+0x8a/0xe0 > > > Nov 27 23:46:53 main kernel: init_module_from_file+0x8a/0xe0 > > > Nov 27 23:46:53 main kernel: idempotent_init_module+0x114/0x310 > > > Nov 27 23:46:53 main kernel: __x64_sys_finit_module+0x6d/0xd0 > > > Nov 27 23:46:53 main kernel: ? syscall_trace_enter+0x8d/0x1d0 > > > Nov 27 23:46:53 main kernel: do_syscall_64+0x82/0x320 > > > Nov 27 23:46:53 main kernel: ? restore_fpregs_from_fpstate+0x46/0xa0 > > > Nov 27 23:46:53 main kernel: ? switch_fpu_return+0x5b/0xe0 > > > Nov 27 23:46:53 main kernel: ? do_syscall_64+0x200/0x320 > > > Nov 27 23:46:53 main kernel: ? exc_page_fault+0x74/0x180 > > > Nov 27 23:46:53 main kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e > > > Nov 27 23:46:53 main kernel: RIP: 0033:0x7f77238f3779 > > > Nov 27 23:46:53 main kernel: Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f > > > 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b > > > 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 4f 86 0d 00 f7 d8 64 > > > 89 01 48 > > > Nov 27 23:46:53 main kernel: RSP: 002b:00007ffc398103f8 EFLAGS: 00000246 > > > ORIG_RAX: 0000000000000139 > > > Nov 27 23:46:53 main kernel: RAX: ffffffffffffffda RBX: 000055e0eb622480 > > > RCX: 00007f77238f3779 > > > Nov 27 23:46:53 main kernel: RDX: 0000000000000004 RSI: 00007f77239f744d > > > RDI: 000000000000001b > > > Nov 27 23:46:53 main kernel: RBP: 0000000000000004 R08: 0000000000000000 > > > R09: 00007f7723ef6280 > > > Nov 27 23:46:53 main kernel: R10: 0000000000000000 R11: 0000000000000246 > > > R12: 00007f77239f744d > > > Nov 27 23:46:53 main kernel: R13: 0000000000020000 R14: 000055e0eb61e630 > > > R15: 0000000000000000 > > > Nov 27 23:46:53 main kernel: </TASK> > > > Nov 27 23:46:53 main kernel: ---[ end trace ]--- > > > > This was specifically with 6.17.8 but up to the current stable 6.17.9 > > there should be no related changes afaics. > > Thanks for the report. As a wild guess, a simple fix like below > should suffice for this case? > > > Takashi > > -- 8< -- > --- a/sound/pci/ctxfi/ctamixer.h > +++ b/sound/pci/ctxfi/ctamixer.h > @@ -22,7 +22,7 @@ > /* Define the descriptor of a summation node resource */ > struct sum { > struct rsc rsc; /* Basic resource info */ > - unsigned char idx[8]; > + unsigned char idx[8 + 1]; /* msr + master */ > }; > > /* Define sum resource request description info */
FWIW, I cannot test this myself. "waxhead", can you please test the proposed patch and report back if it fixes the issue for you? Regards, Salvatore
