pidgin/pidgin

Fix an out of bounds write in purple_markup_linkify.
release-2.x.y
2021-07-08, Gary Kramlich
71df0a528a5a
Fix an out of bounds write in purple_markup_linkify.

This was found by Thomas Roth , Dominik Maier
, and Fabian Freyer .

Testing Done:
Compiled and ran the `purple_markup_linkify_fuzzer` from the google oss-fuzz project to verify the fix.

Reviewed at https://reviews.imfreedom.org/r/781/
#include "conversation.h"
PurpleAccount *purple_accounts_find_ext(const char *name, const char *protocol_id,
gboolean (*account_test)(const PurpleAccount *account));
PurpleAccount *purple_accounts_find_any(const char *name, const char *protocol);
PurpleAccount *purple_accounts_find_connected(const char *name, const char *protocol);