[syzbot] UBSAN: shift-out-of-bounds in dbAlloc

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Sep 26, 2022, 12:32:38 PMSep 26
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Hello,

syzbot found the following issue on:

HEAD commit: f76349cf4145 Linux 6.0-rc7
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15f64288880000
kernel config: https://syzkaller.appspot.com/x/.config?x=ba0d23aa7e1ffaf5
dashboard link: https://syzkaller.appspot.com/bug?extid=a41ec88f6b014e3da07b
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16880b18880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157311df080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a41ec8...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 264192
================================================================================
UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:776:12
shift exponent 1834973817 is too large for 64-bit type 'long long'
CPU: 0 PID: 3608 Comm: syz-executor347 Not tainted 6.0.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
ubsan_epilogue lib/ubsan.c:151 [inline]
__ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
dbAlloc+0xbdc/0xc90 fs/jfs/jfs_dmap.c:776
extBalloc fs/jfs/jfs_extent.c:321 [inline]
extAlloc+0x4b9/0xff0 fs/jfs/jfs_extent.c:122
jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248
__block_write_begin_int+0x5f6/0x1ba0 fs/buffer.c:2006
__block_write_begin fs/buffer.c:2056 [inline]
block_write_begin+0x93/0x1e0 fs/buffer.c:2117
jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304
generic_perform_write+0x2a8/0x5b0 mm/filemap.c:3738
__generic_file_write_iter+0x176/0x400 mm/filemap.c:3866
generic_file_write_iter+0xab/0x310 mm/filemap.c:3898
do_iter_write+0x6c2/0xc20 fs/read_write.c:855
vfs_writev fs/read_write.c:928 [inline]
do_writev+0x23e/0x430 fs/read_write.c:971
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f72b62b4f39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe31a1b658 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f72b62b4f39
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f72b6274700 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00080000000000f8 R15: 0000000000000000
</TASK>
================================================================================


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