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

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

1 files changed, 1 insertions, 0 deletions

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)++)