gvcolor color: fix unchecked allocation failure

diff --git a/cmd/tools/gvcolor.c b/cmd/tools/gvcolor.c
index e0a1d872ccbc9ba76058d8777ed68b3363581448..1cf5fc2d42fb97c0904295bcdd395725063bd83b 100644 (file)
--- a/cmd/tools/gvcolor.c
+++ b/cmd/tools/gvcolor.c
@@ -23,6 +23,7 @@
 #define        NC      3               /* size of HSB color vector */
 
 #include <assert.h>
+#include <cgraph/alloc.h>
 #include <cgraph/cgraph.h>
 #include <cgraph/exit.h>
 #include <math.h>
@@ -147,7 +148,7 @@ static void color(Agraph_t * g)
     nn = agnnodes(g);
     assert(nn >= 0);
     size_t nnodes = (size_t)nn;
-    nlist = malloc(nnodes * sizeof(Agnode_t *));
+    nlist = gv_calloc(nnodes, sizeof(Agnode_t *));
     size_t i = 0;
     for (n = agfstnode(g); n; n = agnxtnode(g, n)) {
        nlist[i++] = n;