Ensure we check i2d_X509 return val

The i2d_X509() function can return a negative value on error. Therefore
we should make sure we check it.

Issue reported by Yuan Jochen Kang.
Reviewed-by: NEmilia Käsper <emilia@openssl.org>

crypto/x509/x_x509.c

@@ -182,10 +182,19 @@ X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length)
 
 int i2d_X509_AUX(X509 *a, unsigned char **pp)
 {
-    int length;
+    int length, tmplen;
+    unsigned char *start = *pp;
     length = i2d_X509(a, pp);
-    if (a)
-        length += i2d_X509_CERT_AUX(a->aux, pp);
+    if (length < 0 || a == NULL)
+        return length;
+
+    tmplen = i2d_X509_CERT_AUX(a->aux, pp);
+    if (tmplen < 0) {
+        *pp = start;
+        return tmplen;
+    }
+    length += tmplen;
+
     return length;
 }
 

ssl/ssl_cert.c

@@ -836,13 +836,18 @@ static int ssl_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
     unsigned char *p;
 
     n = i2d_X509(x, NULL);
-    if (!BUF_MEM_grow_clean(buf, (int)(n + (*l) + 3))) {
+    if (n < 0 || !BUF_MEM_grow_clean(buf, (int)(n + (*l) + 3))) {
         SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
         return 0;
     }
     p = (unsigned char *)&(buf->data[*l]);
     l2n3(n, p);
-    i2d_X509(x, &p);
+    n = i2d_X509(x, &p);
+    if (n < 0) {
+        /* Shouldn't happen */
+        SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB);
+        return 0;
+    }
     *l += n + 3;
 
     return 1;