Fix potential NULL pointer dereferences.

[tinc] / src / openssl / cipher.c

diff --git a/src/openssl/cipher.c b/src/openssl/cipher.c
index 7f73cb1..c0307f8 100644 (file)
--- a/src/openssl/cipher.c
+++ b/src/openssl/cipher.c
@@ -81,6 +81,9 @@ void cipher_close(cipher_t *cipher) {
 }
 
 size_t cipher_keylength(const cipher_t *cipher) {
+       if(!cipher || !cipher->cipher)
+               return 0;
+
        return cipher->cipher->key_len + cipher->cipher->block_size;
 }
 
@@ -221,7 +224,10 @@ bool cipher_decrypt(cipher_t *cipher, const void *indata, size_t inlen, void *ou
 }
 
 int cipher_get_nid(const cipher_t *cipher) {
-       return cipher->cipher ? cipher->cipher->nid : 0;
+       if(!cipher || !cipher->cipher)
+               return 0;
+
+       return cipher->cipher->nid;
 }
 
 bool cipher_active(const cipher_t *cipher) {