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Fix a bug that could allow dns requests with duplicate tx ids

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Spotted by Marko Kreen
This commit is contained in:
Nick Mathewson 2010-11-19 12:37:49 -05:00
parent 1d6e30e6f8
commit e50ba5b61b
1 changed files with 3 additions and 11 deletions
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14
evdns.c
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@ -1108,20 +1108,12 @@ evdns_set_transaction_id_fn(ev_uint16_t (*fn)(void))
static u16
transaction_id_pick(void) {
for (;;) {
const struct request *req = req_head, *started_at;
u16 trans_id = trans_id_function();
if (trans_id == 0xffff) continue;
/* now check to see if that id is already inflight */
req = started_at = req_head;
if (req) {
do {
if (req->trans_id == trans_id) break;
req = req->next;
} while (req != started_at);
}
/* we didn't find it, so this is a good id */
if (req == started_at) return trans_id;
if (request_find_from_trans_id(trans_id) == NULL)
return trans_id;
}
}