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authorOcean Chen <oceanchen@google.com>2019-07-08 07:34:56 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2019-07-11 04:13:53 +0300
commit56f3ce675103e3fb9e631cfb4131fc768bc23e9a (patch)
tree1a97d2f07bd471ed9bdfdef2fb76a7cdb72d4b2c /fs/f2fs
parent6e0cd4a9dd4df1a0afcb454f1e654b5c80685913 (diff)
downloadlinux-56f3ce675103e3fb9e631cfb4131fc768bc23e9a.tar.xz
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/f2fs')
-rw-r--r--fs/f2fs/segment.c5
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];