SSL_COMP_add_compression_method: exit if allocating the new compression method struct fails

Signed-off-by: NKurt Roeckx <kurt@roeckx.be>
Reviewed-by: NMatt Caswell <matt@openssl.org>

ssl/ssl_ciph.c

@@ -1962,6 +1962,13 @@ int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm)
 
 	MemCheck_off();
 	comp=(SSL_COMP *)OPENSSL_malloc(sizeof(SSL_COMP));
+	if (comp == NULL)
+		{
+		MemCheck_on();
+		SSLerr(SSL_F_SSL_COMP_ADD_COMPRESSION_METHOD,ERR_R_MALLOC_FAILURE);
+		return(1);
+		}
+
 	comp->id=id;
 	comp->method=cm;
 	load_builtin_compressions();