Fix potential NULL pointer dereferences.

[tinc] / src / openssl / digest.c

diff --git a/src/openssl/digest.c b/src/openssl/digest.c
index 8d97e3b..0e600b9 100644 (file)
--- a/src/openssl/digest.c
+++ b/src/openssl/digest.c
@@ -115,14 +115,23 @@ bool digest_verify(digest_t *digest, const void *indata, size_t inlen, const voi
 }
 
 int digest_get_nid(const digest_t *digest) {
-       return digest->digest ? digest->digest->type : 0;
+       if(!digest || !digest->digest)
+               return 0;
+
+       return digest->digest->type;
 }
 
 size_t digest_keylength(const digest_t *digest) {
+       if(!digest || !digest->digest)
+               return 0;
+
        return digest->digest->md_size;
 }
 
 size_t digest_length(const digest_t *digest) {
+       if(!digest)
+               return 0;
+
        return digest->maclength;
 }