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Message-ID: <000000000000999ad405ee62b30b@google.com> Date: Sat, 26 Nov 2022 09:09:30 -0800 From: syzbot <syzbot+0558d19c373e44da3c18@...kaller.appspotmail.com> To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org, shaggy@...nel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] UBSAN: array-index-out-of-bounds in txCommit syzbot has found a reproducer for the following issue on: HEAD commit: 644e9524388a Merge tag 'for-v6.1-rc' of git://git.kernel.o.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=16788381880000 kernel config: https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd dashboard link: https://syzkaller.appspot.com/bug?extid=0558d19c373e44da3c18 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=13591573880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c2c7ab880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0968428e17b4/disk-644e9524.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fd4c3bfd0777/vmlinux-644e9524.xz kernel image: https://storage.googleapis.com/syzbot-assets/ee4571f27f1c/bzImage-644e9524.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/0fdce98f569c/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0558d19c373e44da3c18@...kaller.appspotmail.com ================================================================================ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_txnmgr.c:1738:5 index 18 is out of range for type 'xad_t [18]' CPU: 1 PID: 3636 Comm: syz-executor352 Not tainted 6.1.0-rc6-syzkaller-00308-g644e9524388a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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_out_of_bounds+0xdb/0x130 lib/ubsan.c:283 xtLog fs/jfs/jfs_txnmgr.c:1738 [inline] txLog fs/jfs/jfs_txnmgr.c:1391 [inline] txCommit+0x3fb5/0x6d40 fs/jfs/jfs_txnmgr.c:1259 jfs_commit_inode+0x342/0x5a0 fs/jfs/inode.c:108 extAlloc+0xc93/0xff0 fs/jfs/jfs_extent.c:172 jfs_get_block+0x342/0xce0 fs/jfs/inode.c:248 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [inline] block_write_begin+0x93/0x1e0 fs/buffer.c:2102 jfs_write_begin+0x2d/0x60 fs/jfs/inode.c:304 generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3753 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3881 generic_file_write_iter+0xab/0x310 mm/filemap.c:3913 do_iter_write+0x6c2/0xc20 fs/read_write.c:861 iter_file_splice_write+0x7fc/0xfc0 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0xe6/0x1c0 fs/splice.c:931 splice_direct_to_actor+0x4e4/0xc00 fs/splice.c:886 do_splice_direct+0x279/0x3d0 fs/splice.c:974 do_sendfile+0x5fb/0xf80 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x14f/0x1b0 fs/read_write.c:1309 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: 0033:0x7f12751c65e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f12751512f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f12752517f0 RCX: 00007f12751c65e9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006 RBP: 00007f127521e0e4 R08: 0000000000000000 R09: 0000000000000000 R10: 000080001d00c0d0 R11: 0000000000000246 R12: 65732f636f72702f R13: 0030656c69662f2e R14: 0031656c69662f2e R15: 00007f12752517f8 </TASK> ================================================================================
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