Add missing error check for a2i_GENERAL_NAME()

Fixes a segfault reported by Volker Schlecht.

ok jsing

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libcrypto/x509/x509_alt.c b/src/lib/libcrypto/x509/x509_alt.c
index 9dbca9d1e9..52d30f91e8 100644
--- a/src/lib/libcrypto/x509/x509_alt.c
+++ b/src/lib/libcrypto/x509/x509_alt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: x509_alt.c,v 1.6 2022/02/11 17:37:54 tb Exp $ */
+/* $OpenBSD: x509_alt.c,v 1.7 2022/02/11 17:39:36 tb Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project.
  */
@@ -649,6 +649,8 @@ v2i_GENERAL_NAME_ex(GENERAL_NAME *out, const X509V3_EXT_METHOD *method,
         }
 
         ret = a2i_GENERAL_NAME(out, method, ctx, type, value, is_nc);
+        if (ret == NULL)
+                return NULL;
 
         /* Validate what we have for sanity */
         type = x509_constraints_general_to_bytes(ret, &bytes, &len);