1 files changed, 3 insertions, 0 deletions
diff --git a/src/pki_mbedcrypto.c b/src/pki_mbedcrypto.c
index ccce014c..57a4ffae 100644
--- a/src/pki_mbedcrypto.c
+++ b/src/pki_mbedcrypto.c
@@ -917,6 +917,9 @@ ssh_signature pki_signature_from_blob(const ssh_key pubkey,
     switch(type) {
         case SSH_KEYTYPE_RSA:
             sig = pki_signature_from_rsa_blob(pubkey, sig_blob, sig);
+            if (sig == NULL) {
+                return NULL;
+            }
             sig->type_c = ssh_key_signature_to_char(type, hash_type);
             break;
         case SSH_KEYTYPE_ECDSA: {