From: Ocean Chen oceanchen@google.com
[ Upstream commit 56f3ce675103e3fb9e631cfb4131fc768bc23e9a ]
blkoff_off might over 512 due to fs corrupt or security vulnerability. That should be checked before being using.
Use ENTRIES_IN_SUM to protect invalid value in cur_data_blkoff.
Signed-off-by: Ocean Chen oceanchen@google.com Reviewed-by: Chao Yu yuchao0@huawei.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/segment.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 8fc3edb6760c..92f72bb5aff4 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -3261,6 +3261,11 @@ static int read_compacted_summaries(struct f2fs_sb_info *sbi) seg_i = CURSEG_I(sbi, i); segno = le32_to_cpu(ckpt->cur_data_segno[i]); blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]); + if (blk_off > ENTRIES_IN_SUM) { + f2fs_bug_on(sbi, 1); + f2fs_put_page(page, 1); + return -EFAULT; + } seg_i->next_segno = segno; reset_curseg(sbi, i, 0); seg_i->alloc_type = ckpt->alloc_type[i];