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Bound the number of friends you can have to ~4 billion.

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If you have UINT32_MAX friends, then adding one more friend will cause an
overflow of the friend list (wrap to 0) and result in all friends being
deleted. This subsequently results in a null pointer dereference when
we're trying to add one friend to the deleted friend list.
This commit is contained in:
iphydf 2020-04-28 11:10:25 +00:00
parent de3c21b5b7
commit 7edc0a52fe
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1 changed files with 6 additions and 0 deletions
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6
toxcore/Messenger.c
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@ -161,6 +161,12 @@ static int m_handle_lossy_packet(void *object, int friend_num, const uint8_t *pa
static int32_t init_new_friend(Messenger *m, const uint8_t *real_pk, uint8_t status)
{
if (m->numfriends == UINT32_MAX) {
LOGGER_ERROR(m->log, "Friend list full: we have more than 4 billion friends");
/* This is technically incorrect, but close enough. */
return FAERR_NOMEM;
}
/* Resize the friend list if necessary. */
if (realloc_friendlist(m, m->numfriends + 1) != 0) {
return FAERR_NOMEM;