From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 25 May 2016 21:34:41 +0000 (-0400)
Subject: make xattr_resolve_handlers() safe to use with NULL ->s_xattr
X-Git-Tag: v4.7-rc1~51^2
X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=0040773bff7b585fc948565a0558e5a6a4680e96;p=cascardo%2Flinux.git

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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/xattr.c b/fs/xattr.c
index 4231488f2122..fc81e771488a 100644
--- 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)++)