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| author | Chao Yu <chao@kernel.org> | 2022-04-26 20:06:02 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2022-05-06 20:18:12 +0300 |
| commit | 4d17e6fe9293d57081ffdc11e1cf313e25e8fd9e (patch) | |
| tree | fcbe62458ec41873f4dfa6604692456d3bb503d7 /fs | |
| parent | a9163b947ae8f7af7cb8d63606cd87b9facbfe74 (diff) | |
| download | linux-4d17e6fe9293d57081ffdc11e1cf313e25e8fd9e.tar.xz | |
f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count()
As Yanming reported in bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=215897
I have encountered a bug in F2FS file system in kernel v5.17.
The kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can
reproduce the bug by running the following commands:
The kernel message is shown below:
kernel BUG at fs/f2fs/f2fs.h:2511!
Call Trace:
f2fs_remove_inode_page+0x2a2/0x830
f2fs_evict_inode+0x9b7/0x1510
evict+0x282/0x4e0
do_unlinkat+0x33a/0x540
__x64_sys_unlinkat+0x8e/0xd0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x44/0xae
The root cause is: .total_valid_block_count or .total_valid_node_count
could fuzzed to zero, then once dec_valid_node_count() was called, it
will cause BUG_ON(), this patch fixes to print warning info and set
SBI_NEED_FSCK into CP instead of panic.
Cc: stable@vger.kernel.org
Reported-by: Ming Yan <yanming@tju.edu.cn>
Signed-off-by: Chao Yu <chao.yu@oppo.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/f2fs.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index f3eda4f13646..56adc3b68e14 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -2605,11 +2605,17 @@ static inline void dec_valid_node_count(struct f2fs_sb_info *sbi, { spin_lock(&sbi->stat_lock); - f2fs_bug_on(sbi, !sbi->total_valid_block_count); - f2fs_bug_on(sbi, !sbi->total_valid_node_count); + if (unlikely(!sbi->total_valid_block_count || + !sbi->total_valid_node_count)) { + f2fs_warn(sbi, "dec_valid_node_count: inconsistent block counts, total_valid_block:%u, total_valid_node:%u", + sbi->total_valid_block_count, + sbi->total_valid_node_count); + set_sbi_flag(sbi, SBI_NEED_FSCK); + } else { + sbi->total_valid_block_count--; + sbi->total_valid_node_count--; + } - sbi->total_valid_node_count--; - sbi->total_valid_block_count--; if (sbi->reserved_blocks && sbi->current_reserved_blocks < sbi->reserved_blocks) sbi->current_reserved_blocks++; |