JFFS2: Return an error for long filenames

Return an error if a name is too long for JFFS2 rather than
corrupting data.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 8bc7a5018e40..f92840a3a52f 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -78,6 +78,9 @@ static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
 
         D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
 
+        if (target->d_name.len > JFFS2_MAX_NAME_LEN)
+                return ERR_PTR(-ENAMETOOLONG);
+
         dir_f = JFFS2_INODE_INFO(dir_i);
         c = JFFS2_SB_INFO(dir_i->i_sb);