audit: type=1400 audit(1584443215.298:36): avc: denied { map } for pid=7402 comm="syz-executor833" path="/root/syz-executor833497343" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
MINIX-fs: mounting unchecked file system, running fsck is recommended
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline]
IP: test_and_set_bit_lock arch/x86/include/asm/bitops.h:233 [inline]
IP: trylock_buffer include/linux/buffer_head.h:359 [inline]
IP: lock_buffer include/linux/buffer_head.h:365 [inline]
IP: alloc_branch fs/minix/itree_common.c:88 [inline]
IP: get_block+0x6a7/0x10f0 fs/minix/itree_common.c:191
PGD 8e431067 P4D 8e431067 PUD a107f067 PMD 0
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7402 Comm: syz-executor833 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888093a7c1c0 task.stack: ffff888085018000
RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline]
RIP: 0010:test_and_set_bit_lock arch/x86/include/asm/bitops.h:233 [inline]
RIP: 0010:trylock_buffer include/linux/buffer_head.h:359 [inline]
RIP: 0010:lock_buffer include/linux/buffer_head.h:365 [inline]
RIP: 0010:alloc_branch fs/minix/itree_common.c:88 [inline]
RIP: 0010:get_block+0x6a7/0x10f0 fs/minix/itree_common.c:191
RSP: 0018:ffff88808501f808 EFLAGS: 00010246
RAX: 0000000000000007 RBX: ffff88808501f910 RCX: 1ffffffff10279bc
RDX: 0000000000000000 RSI: ffffffff87d842e0 RDI: ffff888093a7c1e4
RBP: ffff88808501f988 R08: 0000000000000001 R09: 0000000000000002
R10: ffff888093a7ca90 R11: ffff888093a7c1c0 R12: ffff88808501f8d4
R13: ffff8880941ad960 R14: dffffc0000000000 R15: 0000000000000000
FS: 000000000162a940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007d4bb000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
minix_get_block+0xd6/0x100 fs/minix/inode.c:379
__block_write_begin_int+0x337/0x1030 fs/buffer.c:2027
__block_write_begin fs/buffer.c:2077 [inline]
block_write_begin+0x58/0x260 fs/buffer.c:2136
minix_write_begin+0x35/0xc0 fs/minix/inode.c:415
generic_perform_write+0x1c9/0x420 mm/filemap.c:3047
__generic_file_write_iter+0x227/0x590 mm/filemap.c:3172
generic_file_write_iter+0x2fa/0x650 mm/filemap.c:3200
call_write_iter include/linux/fs.h:1777 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x44e/0x630 fs/read_write.c:482
vfs_write+0x192/0x4e0 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xf2/0x210 fs/read_write.c:582
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x444c19
RSP: 002b:00007fff8a02d308 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fff8a02d310 RCX: 0000000000444c19
RDX: 00000000ffffff2e RSI: 0000000020000040 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000401000 R09: 0000000000401000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402880
R13: 0000000000402910 R14: 0000000000000000 R15: 0000000000000000
Code: ca 08 00 00 49 8b bf 28 01 00 00 b9 08 00 00 00 e8 5f 07 c6 ff 31 d2 be 6c 01 00 00 48 c7 c7 e0 f2 b9 86 49 89 c7 e8 e9 48 6d ff <f0> 41 0f ba 2f 02 0f 83 1f fe ff ff e8 98 33 89 ff 4c 89 ff e8
RIP: test_and_set_bit arch/x86/include/asm/bitops.h:220 [inline] RSP: ffff88808501f808
RIP: test_and_set_bit_lock arch/x86/include/asm/bitops.h:233 [inline] RSP: ffff88808501f808
RIP: trylock_buffer include/linux/buffer_head.h:359 [inline] RSP: ffff88808501f808
RIP: lock_buffer include/linux/buffer_head.h:365 [inline] RSP: ffff88808501f808
RIP: alloc_branch fs/minix/itree_common.c:88 [inline] RSP: ffff88808501f808
RIP: get_block+0x6a7/0x10f0 fs/minix/itree_common.c:191 RSP: ffff88808501f808
CR2: 0000000000000000
---[ end trace 6336850785786139 ]---