hfs: add sanity check for file name length

On a corrupted file system the ->len field could be wrong leading to a buffer overflow. Reported-and-acked-by: Clement LECIGNE <[email protected]> Signed-off-by: Dan Carpenter <[email protected]> Cc: [email protected] Signed-off-by: Linus Torvalds <[email protected]>
sanyoo · Nov 15, 2011 · bc5b8a9 · bc5b8a9
1 parent 7f80850
commit bc5b8a9
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/fs/hfs/trans.c b/fs/hfs/trans.c
@@ -40,6 +40,8 @@ int hfs_mac2asc(struct super_block *sb, char *out, const struct hfs_name *in)
 
 	src = in->name;
 	srclen = in->len;
+	if (srclen > HFS_NAMELEN)
+		srclen = HFS_NAMELEN;
 	dst = out;
 	dstlen = HFS_MAX_NAMELEN;
 	if (nls_io) {