Update from stable branch.

crypto/pkcs12/p12_crt.c

diff --git a/crypto/pkcs12/p12_crt.c b/crypto/pkcs12/p12_crt.c
index acac216..96b131d 100644
--- a/crypto/pkcs12/p12_crt.c
+++ b/crypto/pkcs12/p12_crt.c
@@ -159,6 +159,9 @@
 
 	p12 = PKCS12_add_safes(safes, 0);
 
+	if (!p12)
+		goto err;
+
 	sk_PKCS7_pop_free(safes, PKCS7_free);
 
 	safes = NULL;