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Fix stack clobber in new uuid-ossp code.

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The V5 (SHA1 hashing) code wrote 20 bytes into a 16-byte local variable.
This had accidentally failed to fail in my testing and Matteo's, but
buildfarm results exposed the problem.
This commit is contained in:
Tom Lane 2014-05-28 11:50:41 -04:00
parent 8232d6df4c
commit 2103218dd4
1 changed files with 4 additions and 1 deletions
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5
contrib/uuid-ossp/uuid-ossp.c
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@ -316,16 +316,19 @@ uuid_generate_internal(int v, unsigned char *ns, char *ptr, int len)
MD5Init(&ctx);
MD5Update(&ctx, ns, sizeof(uu));
MD5Update(&ctx, (unsigned char *) ptr, len);
/* we assume sizeof MD5 result is 16, same as UUID size */
MD5Final((unsigned char *) &uu, &ctx);
}
else
{
SHA1_CTX ctx;
unsigned char sha1result[SHA1_RESULTLEN];
SHA1Init(&ctx);
SHA1Update(&ctx, ns, sizeof(uu));
SHA1Update(&ctx, (unsigned char *) ptr, len);
SHA1Final((unsigned char *) &uu, &ctx);
SHA1Final(sha1result, &ctx);
memcpy(&uu, sha1result, sizeof(uu));
}
/* the calculated hash is using local order */