From e97f8b5a9cc6c0cdbffa4da214b98299cd68a096 Mon Sep 17 00:00:00 2001
From: Chris Conlon <chris@wolfssl.com>
Date: Wed, 20 Dec 2017 12:18:49 -0700
Subject: [PATCH] fix scanbuild issues, internal.c and tfm.c

---
 src/internal.c      | 5 +++++
 wolfcrypt/src/tfm.c | 6 +++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/internal.c b/src/internal.c
index d76ace244..0ced00f78 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -6022,6 +6022,9 @@ static void AddHandShakeHeader(byte* output, word32 length,
 
     /* handshake header */
     hs = (HandShakeHeader*)output;
+    if (hs == NULL)
+        return;
+
     hs->type = type;
     c32to24(length, hs->length);         /* type and length same for each */
 #ifdef WOLFSSL_DTLS
@@ -14098,6 +14101,8 @@ int SendAlert(WOLFSSL* ssl, int severity, int type)
     /* get output buffer */
     output = ssl->buffers.outputBuffer.buffer +
              ssl->buffers.outputBuffer.length;
+    if (output == NULL)
+        return BUFFER_E;
 
     input[0] = (byte)severity;
     input[1] = (byte)type;
diff --git a/wolfcrypt/src/tfm.c b/wolfcrypt/src/tfm.c
index 82169ae1f..81edccd0b 100644
--- a/wolfcrypt/src/tfm.c
+++ b/wolfcrypt/src/tfm.c
@@ -2915,9 +2915,9 @@ int fp_isprime_ex(fp_int *a, int t)
 
    /* do trial division */
    for (r = 0; r < FP_PRIME_SIZE; r++) {
-       fp_mod_d(a, primes[r], &d);
-       if (d == 0) {
-          return FP_NO;
+       res = fp_mod_d(a, primes[r], &d);
+       if (res != MP_OKAY || d == 0) {
+           return FP_NO;
        }
    }