Messages in this thread Patch in this message | | | Date | Wed, 3 Jul 2019 23:33:20 +0800 | Subject | [PATCH v3] f2fs: avoid out-of-range memory access | From | Ocean Chen <> |
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blk_off might over 512 due to fs corrupt and should be checked before being used. Use ENTRIES_IN_SUM to protect invalid memory access.
-- v2: - fix typo v3: - check blk_off before being used -- Signed-off-by: Ocean Chen <oceanchen@google.com> --- fs/f2fs/segment.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 8dee063c833f..c3eae3239345 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -3401,6 +3401,9 @@ static int read_compacted_summaries(struct f2fs_sb_info *sbi) if (seg_i->alloc_type == SSR) blk_off = sbi->blocks_per_seg; + if (blk_off >= ENTRIES_IN_SUM) + return -EFAULT; + for (j = 0; j < blk_off; j++) { struct f2fs_summary *s; s = (struct f2fs_summary *)(kaddr + offset); -- 2.22.0.410.gd8fdbe21b5-goog
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