make xattr_resolve_handlers() safe to use with NULL ->s_xattr

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-05-25 17:34:41 -04:00 · 2016-05-25 17:34:41 -04:00 · 0040773bff
commit 0040773bff
parent aaf431b4f9
1 changed files with 1 additions and 0 deletions
--- a/fs/xattr.c
+++ b/fs/xattr.c
@ -655,6 +655,7 @@ strcmp_prefix(const char *a, const char *a_prefix)
 * operations to the correct xattr_handler.
 */
 #define for_each_xattr_handler(handlers, handler)		\
+	if (handlers)						\
 		for ((handler) = *(handlers)++;			\
 			(handler) != NULL;			\
 			(handler) = *(handlers)++)