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nss: check for PK11_CreateDigestContext() returning NULL 

... to avoid crashes!

Reported-by: Hao Wu
Fixes #5302
Closes #5303
This commit is contained in:
Daniel Stenberg 2020-04-27 12:21:17 +02:00
parent e2b1ccb99b
commit cad15b9f92
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GPG Key ID: 5CC908FDB71E12C2
1 changed files with 6 additions and 0 deletions
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6
lib/vtls/nss.c
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@ -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);