mac siphash: add missing NULL check on context creation

Bug reported by Kihong Heo.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10613)

diff --git a/providers/implementations/macs/siphash_prov.c b/providers/implementations/macs/siphash_prov.c
index d1cb5cf1e7599d15acd10c8ce3cd7c10d5a97bca..e82f94ce7bd939bbd4d1845c467c9b40a2022944 100644 (file)
--- a/providers/implementations/macs/siphash_prov.c
+++ b/providers/implementations/macs/siphash_prov.c
@@ -51,7 +51,8 @@ static void *siphash_new(void *provctx)
 {
     struct siphash_data_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
 
-    ctx->provctx = provctx;
+    if (ctx != NULL)
+        ctx->provctx = provctx;
     return ctx;
 }