UBSAN: array-index-out-of-bounds in f2fs_truncate_inode

Title	Replies (including bot)	Last reply
[syzbot] [f2fs?] UBSAN: array-index-out-of-bounds in f2fs_truncate_inode_blocks (2)	0 (1)	2025/02/20 08:42

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	UBSAN: array-index-out-of-bounds in f2fs_truncate_inode_blocks f2fs				1	146d	142d	0/28	auto-obsoleted due to no activity on 2025/01/06 22:40

F2FS-fs (loop0): access invalid blkaddr:1
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 __f2fs_is_valid_blkaddr+0xe16/0x1460 fs/f2fs/checkpoint.c:213
 f2fs_map_blocks+0xd93/0x4e70 fs/f2fs/data.c:1586
 f2fs_preallocate_blocks fs/f2fs/file.c:4836 [inline]
 f2fs_file_write_iter+0x1125/0x2550 fs/f2fs/file.c:5072
 aio_write+0x56b/0x7c0 fs/aio.c:1633
 io_submit_one+0x8a7/0x18a0 fs/aio.c:2052
 __do_sys_io_submit fs/aio.c:2111 [inline]
 __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f238798cde9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f23888cc038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f2387ba5fa0 RCX: 00007f238798cde9
RDX: 0000400000000700 RSI: 0000000000001417 RDI: 00007f2388883000
RBP: 00007f2387a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2387ba5fa0 R15: 00007ffc34e50188
 </TASK>
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/f2fs/node.h:381:10
index 18446744073709550692 is out of range for type '__le32[5]' (aka 'unsigned int[5]')
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted 6.14.0-rc3-syzkaller-00060-g6537cfb395f3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 get_nid fs/f2fs/node.h:381 [inline]
 f2fs_truncate_inode_blocks+0xa5e/0xf60 fs/f2fs/node.c:1181
 f2fs_do_truncate_blocks+0x782/0x1030 fs/f2fs/file.c:808
 f2fs_truncate_blocks+0x10d/0x300 fs/f2fs/file.c:836
 f2fs_truncate+0x417/0x720 fs/f2fs/file.c:886
 f2fs_file_write_iter+0x1bdb/0x2550 fs/f2fs/file.c:5093
 aio_write+0x56b/0x7c0 fs/aio.c:1633
 io_submit_one+0x8a7/0x18a0 fs/aio.c:2052
 __do_sys_io_submit fs/aio.c:2111 [inline]
 __se_sys_io_submit+0x171/0x2e0 fs/aio.c:2081
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f238798cde9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f23888cc038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007f2387ba5fa0 RCX: 00007f238798cde9
RDX: 0000400000000700 RSI: 0000000000001417 RDI: 00007f2388883000
RBP: 00007f2387a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2387ba5fa0 R15: 00007ffc34e50188
 </TASK>
---[ end trace ]---

Time	Kernel	Commit	Syzkaller	Config	Log	Report	Assets (help?)	Manager	Title
2025/02/19 15:58	upstream	6537cfb395f3	cbd8edab	.config	console log	report	[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	UBSAN: array-index-out-of-bounds in f2fs_truncate_inode_blocks
2025/02/17 15:39	upstream	0ad2507d5d93	4121cf9d	.config	console log	report	[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	UBSAN: array-index-out-of-bounds in f2fs_truncate_inode_blocks
2025/02/16 08:38	upstream	ad1b832bf1cf	40a34ec9	.config	console log	report	[disk image (non-bootable)] [vmlinux] [kernel image]	ci-snapshot-upstream-root	UBSAN: array-index-out-of-bounds in f2fs_truncate_inode_blocks