On Tue 31-12-24 05:27:19, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 8155b4ef3466 Add linux-next specific files for 20241220 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=105ba818580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9c90bb7161a56c88 > dashboard link: https://syzkaller.appspot.com/bug?extid=6a3aa63412255587b21b > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e670b0580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13f42ac4580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/98a974fc662d/disk-8155b4ef.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/2dea9b72f624/vmlinux-8155b4ef.xz > kernel image: https://storage.googleapis.com/syzbot-assets/593a42b9eb34/bzImage-8155b4ef.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+6a3aa63412255587b21b@xxxxxxxxxxxxxxxxxxxxxxxxx > > RAX: ffffffffffffffda RBX: 00007ffd163c2680 RCX: 00007f8b75a4d669 > RDX: 00007f8b75a4c8a0 RSI: 0000000000000000 RDI: 0000000000000008 > RBP: 0000000000000001 R08: 00007ffd163c2407 R09: 00000000000000a0 > R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001 > R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 > </TASK> > ================================================================== > BUG: KASAN: use-after-free in instrument_write include/linux/instrumented.h:40 [inline] > BUG: KASAN: use-after-free in ___clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:44 [inline] > BUG: KASAN: use-after-free in __clear_open_fd fs/file.c:324 [inline] > BUG: KASAN: use-after-free in __put_unused_fd+0xdb/0x2a0 fs/file.c:600 > Write of size 8 at addr ffff88804952aa48 by task syz-executor128/5830 Good catch. Thanks! Should be fixed now: #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git for_next Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
