[gnurl] 258/264: nss: check for PK11_CreateDigestContext() returning NULL

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commit cad15b9f92812ea4cdec6b65b7e2a83bdc007eb3
Author: Daniel Stenberg <address@hidden>
AuthorDate: Mon Apr 27 12:21:17 2020 +0200

    nss: check for PK11_CreateDigestContext() returning NULL
    
    ... to avoid crashes!
    
    Reported-by: Hao Wu
    Fixes #5302
    Closes #5303
---
 lib/vtls/nss.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index 3a65a66be..16ec409e9 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -2374,6 +2374,9 @@ static CURLcode Curl_nss_md5sum(unsigned char *tmp, /* 
input */
   PK11Context *MD5pw = PK11_CreateDigestContext(SEC_OID_MD5);
   unsigned int MD5out;
 
+  if(!MD5pw)
+    return CURLE_NOT_BUILT_IN;
+
   PK11_DigestOp(MD5pw, tmp, curlx_uztoui(tmplen));
   PK11_DigestFinal(MD5pw, md5sum, &MD5out, curlx_uztoui(md5len));
   PK11_DestroyContext(MD5pw, PR_TRUE);
@@ -2389,6 +2392,9 @@ static CURLcode Curl_nss_sha256sum(const unsigned char 
*tmp, /* input */
   PK11Context *SHA256pw = PK11_CreateDigestContext(SEC_OID_SHA256);
   unsigned int SHA256out;
 
+  if(!SHA256pw)
+    return CURLE_NOT_BUILT_IN;
+
   PK11_DigestOp(SHA256pw, tmp, curlx_uztoui(tmplen));
   PK11_DigestFinal(SHA256pw, sha256sum, &SHA256out, curlx_uztoui(sha256len));
   PK11_DestroyContext(SHA256pw, PR_TRUE);

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