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f2fs: check if file namelen exceeds max value 

Dentry bitmap is not enough to detect incorrect dentries. So this patch
also checks the namelen value of a dentry.

Signed-off-by: Gong Chen <gongchen4@huawei.com>
Signed-off-by: Sheng Yong <shengyong1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sheng Yong 2019-01-07 15:02:34 +08:00 committed by Jaegeuk Kim
parent ddf06b753a
commit 720db06863
1 changed files with 2 additions and 1 deletions
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3
fs/f2fs/dir.c
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@ -814,7 +814,8 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
/* check memory boundary before moving forward */
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
if (unlikely(bit_pos > d->max)) {
if (unlikely(bit_pos > d->max ||
le16_to_cpu(de->name_len) > F2FS_NAME_LEN)) {
f2fs_msg(sbi->sb, KERN_WARNING,
"%s: corrupted namelen=%d, run fsck to fix.",
__func__, le16_to_cpu(de->name_len));