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Fix incorrect overflow handling in the DHT's parser.

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This commit is contained in:
Juliusz Chroboczek
2011-01-10 01:58:13 +00:00
parent 62cb43a173
commit 429754cfb5
2 changed files with 6 additions and 3 deletions
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5
third-party/dht/CHANGES vendored
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@@ -1,3 +1,8 @@
dht-0.18 (unreleased)
* Fix a bug that could cause parse_message to enter an infinite loop
on overflow.
9 January 2011: dht-0.17:
* Fix a bug that prevented calling dht_init after dht_uninit.

4
third-party/dht/dht.c vendored
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@@ -2825,21 +2825,19 @@ parse_message(const unsigned char *buf, int buflen,
l = strtol((char*)buf + i, &q, 10);
if(q && *q == ':' && l > 0) {
CHECK(q + 1, l);
i = q + 1 + l - (char*)buf;
if(l == 6) {
if(j + l > *values_len)
continue;
i = q + 1 + l - (char*)buf;
memcpy((char*)values_return + j, q + 1, l);
j += l;
} else if(l == 18) {
if(j6 + l > *values6_len)
continue;
i = q + 1 + l - (char*)buf;
memcpy((char*)values6_return + j6, q + 1, l);
j6 += l;
} else {
debugf("Received weird value -- %d bytes.\n", (int)l);
i = q + 1 + l - (char*)buf;
}
} else {
break;