On Wed, Jun 25, 2025 at 02:27:28AM -0700, syzbot wrote: > syzbot found the following issue on: > > HEAD commit: 714db279942b CREDITS: Add entry for Shannon Nelson
Which does not include 7544f3f5b0b5 ("bridge: mcast: Fix use-after-free during router port configuration"). > git tree: net > console output: https://syzkaller.appspot.com/x/log.txt?x=11a59b0c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d11f52d3049c3790 > dashboard link: https://syzkaller.appspot.com/bug?extid=f53271ac312b49be132b > compiler: Debian clang version 20.1.6 > (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/4af647f77fe2/disk-714db279.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/df9d2caceadd/vmlinux-714db279.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/f05e60d250ae/bzImage-714db279.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+f53271ac312b49be1...@syzkaller.appspotmail.com > > ================================================================== > BUG: KASAN: slab-use-after-free in > br_multicast_has_router_adjacent+0x401/0x4e0 net/bridge/br_multicast.c:5005 Use-after-free in the multicast router list which should be fixed by 7544f3f5b0b5 ("bridge: mcast: Fix use-after-free during router port configuration"). [...] > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title #syz fix: bridge: mcast: Fix use-after-free during router port configuration