syzbot

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BUG: KASAN: stack-out-of-bounds in should_fault_in_pages fs/gfs2/file.c:784 [inline]
BUG: KASAN: stack-out-of-bounds in gfs2_file_direct_read fs/gfs2/file.c:854 [inline]
BUG: KASAN: stack-out-of-bounds in gfs2_file_read_iter+0x45b/0xe40 fs/gfs2/file.c:961
Read of size 8 at addr ffffc90004027d30 by task syz-executor.2/3908

CPU: 1 PID: 3908 Comm: syz-executor.2 Not tainted 5.15.158-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 should_fault_in_pages fs/gfs2/file.c:784 [inline]
 gfs2_file_direct_read fs/gfs2/file.c:854 [inline]
 gfs2_file_read_iter+0x45b/0xe40 fs/gfs2/file.c:961
 call_read_iter include/linux/fs.h:2166 [inline]
 new_sync_read fs/read_write.c:404 [inline]
 vfs_read+0xa9f/0xe10 fs/read_write.c:485
 ksys_read+0x1a2/0x2c0 fs/read_write.c:623
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f36d8a3dca9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f36d6fb00c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f36d8b6bf80 RCX: 00007f36d8a3dca9
RDX: 0000000000002019 RSI: 000000002000ac40 RDI: 0000000000000004
RBP: 00007f36d8a8947e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f36d8b6bf80 R15: 00007ffd6279c0b8
 </TASK>


addr ffffc90004027d30 is located in stack of task syz-executor.2/3908 at offset 48 in frame:
 vfs_read+0x0/0xe10

this frame has 3 objects:
 [32, 48) 'iov.i'
 [64, 112) 'kiocb.i'
 [144, 184) 'iter.i'

Memory state around the buggy address:
 ffffc90004027c00: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffc90004027c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90004027d00: f1 f1 f1 f1 00 00 f2 f2 00 00 00 00 00 00 f2 f2
                                     ^
 ffffc90004027d80: f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
 ffffc90004027e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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