Safety checks

varnish · Jul 6, 2016 · d507a7b · d507a7b
1 parent 53920fc
commit d507a7b
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/vmod_null.c b/src/vmod_null.c
@@ -7,9 +7,15 @@
 VCL_VOID
 vmod_synth(const struct vrt_ctx *ctx, VCL_STRING name, VCL_INT len)
 {
+	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
+
 	assert(ctx->method == VCL_MET_SYNTH ||
 	    ctx->method == VCL_MET_BACKEND_ERROR);
 
+	if (name == NULL || len <= 0) {
+		return;
+	}
+
 	CHECK_OBJ_NOTNULL((struct vsb*)ctx->specific, VSB_MAGIC);
 
 	VSB_bcat((struct vsb*)ctx->specific, name, len);