Commit 720db068 authored by Sheng Yong's avatar Sheng Yong Committed by Jaegeuk Kim

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: default avatarGong Chen <gongchen4@huawei.com>
Signed-off-by: default avatarSheng Yong <shengyong1@huawei.com>
Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent ddf06b75
...@@ -814,7 +814,8 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d, ...@@ -814,7 +814,8 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
/* check memory boundary before moving forward */ /* check memory boundary before moving forward */
bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len)); 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, f2fs_msg(sbi->sb, KERN_WARNING,
"%s: corrupted namelen=%d, run fsck to fix.", "%s: corrupted namelen=%d, run fsck to fix.",
__func__, le16_to_cpu(de->name_len)); __func__, le16_to_cpu(de->name_len));
......
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