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crypto: return NULL cryptoctx if protocol string is empty.

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Badly formed messages that don't specify a protocol in
signed/encrypted parts, end up with a protocol of NULL.  strcasecmp in
notmuch_crypto_get_context then segfaults when trying to check it
against known protocols.  If the protocol is NULL, just return an
empty context immediately (with appropriate message.)
This commit is contained in:
Jameson Graef Rollins 2013-07-19 08:36:12 -07:00 committed by David Bremner
parent 03e2def474
commit 348437243c
1 changed files with 5 additions and 0 deletions
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5
crypto.c
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@ -69,6 +69,11 @@ notmuch_crypto_get_context (notmuch_crypto_t *crypto, const char *protocol)
{
notmuch_crypto_context_t *cryptoctx = NULL;
if (! protocol) {
fprintf (stderr, "Cryptographic protocol is empty.\n");
return cryptoctx;
}
/* As per RFC 1847 section 2.1: "the [protocol] value token is
* comprised of the type and sub-type tokens of the Content-Type".
* As per RFC 1521 section 2: "Content-Type values, subtypes, and