adding NULL check to make it fail safe.

Signed-Off-By : Ameen Ali <ameenali...@gmail.com>
---
 crypto/asymmetric_keys/x509_public_key.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crypto/asymmetric_keys/x509_public_key.c 
b/crypto/asymmetric_keys/x509_public_key.c
index 2a44b37..76610cc 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -286,6 +286,10 @@ static int x509_key_preparse(struct key_preparsed_payload 
*prep)
        char *desc = NULL, *p;
        int ret;
 
+       if(prep == NULL){
+               pr_debug("NULL payload");
+               return PTR_ERR(prep);
+       }
        cert = x509_cert_parse(prep->data, prep->datalen);
        if (IS_ERR(cert))
                return PTR_ERR(cert);
-- 
2.5.0

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