Hello, syzbot found the following crash on: HEAD commit: 6a8b55ed Linux 5.7-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11b91564100000 kernel config: https://syzkaller.appspot.com/x/.config?x=5b075813ec8b93cd dashboard link: https://syzkaller.appspot.com/bug?extid=afb77bdbaca0cda9e991 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f8067fe00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17fd8028100000 The bug was bisected to: commit b877ad1a135c802d4529a72aa82faf46ef5db097 Author: Ard Biesheuvel <ardb@xxxxxxxxxx> Date: Tue Nov 5 14:01:04 2019 +0000 crypto: omap-aes-gcm - check length of assocdata in RFC4106 mode bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=147c2208100000 final crash: https://syzkaller.appspot.com/x/report.txt?x=167c2208100000 console output: https://syzkaller.appspot.com/x/log.txt?x=127c2208100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+afb77bdbaca0cda9e991@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: b877ad1a135c ("crypto: omap-aes-gcm - check length of assocdata in RFC4106 mode") ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 7775 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7775 Comm: syz-executor692 Not tainted 5.7.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] fixup_bug arch/x86/kernel/traps.c:170 [inline] do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Code: 06 31 ff 89 de e8 87 b9 dc fd 84 db 0f 85 36 ff ff ff e8 4a b8 dc fd 48 c7 c7 a0 5b 72 88 c6 05 b2 1c ee 06 01 e8 4f f3 ad fd <0f> 0b e9 17 ff ff ff e8 2b b8 dc fd 0f b6 1d 97 1c ee 06 31 ff 89 RSP: 0018:ffffc90002797bf8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ce171 RDI: fffff520004f2f71 RBP: 0000000000000002 R08: ffff88809d9e6400 R09: ffffed1015cc66a9 R10: ffff8880ae633547 R11: ffffed1015cc66a8 R12: ffff8880a403a048 R13: ffff88809df99d00 R14: ffffed1013bf33a5 R15: ffff888099925048 refcount_add include/linux/refcount.h:204 [inline] refcount_inc include/linux/refcount.h:241 [inline] crypto_alg_get crypto/internal.h:87 [inline] crypto_mod_get+0xc6/0xf0 crypto/api.c:37 crypto_spawn_alg.isra.0+0xa8/0x110 crypto/algapi.c:723 crypto_spawn_tfm2+0x19/0xb0 crypto/algapi.c:763 crypto_spawn_aead include/crypto/internal/aead.h:102 [inline] pcrypt_aead_init_tfm+0x144/0x273 crypto/pcrypt.c:182 crypto_aead_init_tfm+0x138/0x1a0 crypto/aead.c:140 crypto_create_tfm+0xd5/0x2f0 crypto/api.c:454 crypto_alloc_tfm+0x100/0x340 crypto/api.c:526 aead_bind+0x69/0x170 crypto/algif_aead.c:483 alg_bind+0x260/0x530 crypto/af_alg.c:182 __sys_bind+0x20e/0x250 net/socket.c:1662 __do_sys_bind net/socket.c:1673 [inline] __se_sys_bind net/socket.c:1671 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1671 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x441359 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd04b593e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00000000004a2378 RCX: 0000000000441359 RDX: 0000000000000058 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 000000000000e5c5 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004020d0 R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
