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| author | Zhiguo Niu <zhiguo.niu@unisoc.com> | 2024-02-28 12:59:54 +0100 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2024-03-04 18:51:58 +0100 |
| commit | 36959d18c3cf09b3c12157c6950e18652067de77 (patch) | |
| tree | a7a9ec121fcf9fa00ec6f923a1569bdf4b371210 /fs/f2fs/segment.c | |
| parent | f2fs: fix to reset fields for unloaded curseg (diff) | |
| download | linux-36959d18c3cf09b3c12157c6950e18652067de77.tar.xz linux-36959d18c3cf09b3c12157c6950e18652067de77.zip | |
f2fs: fix to do sanity check in update_sit_entry
If GET_SEGNO return NULL_SEGNO for some unecpected case,
update_sit_entry will access invalid memory address,
cause system crash. It is better to do sanity check about
GET_SEGNO just like update_segment_mtime & locate_dirty_segment.
Also remove some redundant judgment code.
Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/segment.c')
| -rw-r--r-- | fs/f2fs/segment.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index fa395801137b..0d21ce615cec 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2413,6 +2413,8 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del) #endif segno = GET_SEGNO(sbi, blkaddr); + if (segno == NULL_SEGNO) + return; se = get_seg_entry(sbi, segno); new_vblocks = se->valid_blocks + del; @@ -3526,8 +3528,7 @@ int f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page, * since SSR needs latest valid block information. */ update_sit_entry(sbi, *new_blkaddr, 1); - if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) - update_sit_entry(sbi, old_blkaddr, -1); + update_sit_entry(sbi, old_blkaddr, -1); /* * If the current segment is full, flush it out and replace it with a |