bug fixes for check null in NSProviderMemoryCache.

Added check null about list and list->head.

Change-Id: Ie1df2395a14d20a012383d7f5865e96fc2405b91
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/9877
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Hun-je Yeon <hunje.yeon@samsung.com>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>

diff --git a/service/notification/src/provider/cache/linux/NSProviderMemoryCache.c b/service/notification/src/provider/cache/linux/NSProviderMemoryCache.c
index 305bd8f..8be56ba 100755 (executable)
--- a/service/notification/src/provider/cache/linux/NSProviderMemoryCache.c
+++ b/service/notification/src/provider/cache/linux/NSProviderMemoryCache.c
@@ -295,6 +295,12 @@ bool NSIsSameObId(NSCacheSubData * data, OCObservationId id)
 \r
 NSResult NSProviderDeleteSubDataFromObId(NSCacheList * list, OCObservationId id)\r
 {\r
+    if(!list || !list->head)\r
+    {\r
+        NS_LOG(INFO, "list is NULL");\r
+        return NS_FAIL;\r
+    }\r
+\r
     pthread_mutex_lock(&NSCacheMutex);\r
     NSCacheElement * prev = list->head;\r
     NSCacheElement * del = list->head;\r