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authorChao Yu <chao@kernel.org>2022-04-26 20:06:02 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2022-05-06 20:18:12 +0300
commit4d17e6fe9293d57081ffdc11e1cf313e25e8fd9e (patch)
treefcbe62458ec41873f4dfa6604692456d3bb503d7 /fs/f2fs
parenta9163b947ae8f7af7cb8d63606cd87b9facbfe74 (diff)
downloadlinux-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/f2fs')
-rw-r--r--fs/f2fs/f2fs.h14
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++;