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| author |   Ocean Chen <oceanchen@google.com> | 2019-07-08 12:34:56 +0800 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk@kernel.org> | 2019-07-10 18:13:53 -0700 |
| commit | 56f3ce675103e3fb9e631cfb4131fc768bc23e9a (patch) | |
| tree | 1a97d2f07bd471ed9bdfdef2fb76a7cdb72d4b2c /fs | |
| parent | f2fs: fix to avoid long latency during umount (diff) | |
| download | wireguard-linux-56f3ce675103e3fb9e631cfb4131fc768bc23e9a.tar.xz wireguard-linux-56f3ce675103e3fb9e631cfb4131fc768bc23e9a.zip | |
f2fs: avoid out-of-range memory access
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/segment.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 2d1d7baaf1b6..a661ac32e829 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -3447,6 +3447,11 @@ 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]; |