[Xen-devel] [PATCH] Pointer should be checked before use

["Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx>]

Signed-off-by: Xiaowei Yang <xiaowei.yang@xxxxxxxxx>

diff -r c70d47b78f65 -r 89710484b825 tools/libxc/xc_linux.c
--- a/tools/libxc/xc_linux.c    Tue Jan 08 02:30:24 2008 +0800
+++ b/tools/libxc/xc_linux.c    Tue Jan 08 05:37:23 2008 +0800
@@ -472,7 +472,10 @@ void *xc_gnttab_map_grant_refs(int xcg_h
     struct ioctl_gntdev_map_grant_ref *map;
     void *addr = NULL;
     int i;
-
+
+    if ( domids == NULL || refs == NULL )
+        return NULL;
+
     map = malloc(sizeof(*map) +
                  (count-1) * sizeof(struct
ioctl_gntdev_map_grant_ref));
     if ( map == NULL )

Regards, 
Xiaowei 


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