diff options
| author | Zhiguo Niu <zhiguo.niu@unisoc.com> | 2024-02-28 19:59:54 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-29 17:30:38 +0200 |
| commit | fbc877741ab5e2c9d7bdb66fb97688b4492a481c (patch) | |
| tree | 2729f5e58cb18d61b9c952c750d39c5702913b18 | |
| parent | c2adaaad83ce99994f9b3ab180327687cd3e354e (diff) | |
f2fs: fix to do sanity check in update_sit_entry
[ Upstream commit 36959d18c3cf09b3c12157c6950e18652067de77 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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 1264a350d4d7..947849e66b0a 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -2191,6 +2191,8 @@ 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; @@ -3286,8 +3288,7 @@ void 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 (!__has_curseg_space(sbi, curseg)) { if (from_gc) |