http: fix nul deref on memcap reached

HttpRangeOpenFileAux may return NULL in different cases, including
when memcap is reached.
But is only caller did not check it before calling HttpRangeAppendData
which would dereference the NULL value.

Ticket: 7029

diff --git a/src/app-layer-htp-range.c b/src/app-layer-htp-range.c
index 3cdde35ba288fcfb59e7510bca2b9e0c802ad9ee..f0d75a9750c05a2005d866d3865884efcfa500f7 100644 (file)
--- a/src/app-layer-htp-range.c
+++ b/src/app-layer-htp-range.c
@@ -351,8 +351,10 @@ static HttpRangeContainerBlock *HttpRangeOpenFile(HttpRangeContainerFile *c, uin
 {
     HttpRangeContainerBlock *r =
             HttpRangeOpenFileAux(c, start, end, total, sbcfg, name, name_len, flags);
-    if (HttpRangeAppendData(sbcfg, r, data, len) < 0) {
-        SCLogDebug("Failed to append data while opening");
+    if (r) {
+        if (HttpRangeAppendData(sbcfg, r, data, len) < 0) {
+            SCLogDebug("Failed to append data while opening");
+        }
     }
     return r;
 }