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Code Issues Releases Wiki Activity

ipp2p: try to address underflows

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Report by: Christian Blum <chrblum@users.sourceforge.net>

"I have found that they panic in an interrupt within xt_ipp2p, function
search_all_gnu(). It's a bounds checking problem; when I add this [a
check for plen >= 65535] at the beginning [of the function] the
servers run fine (very similar to find_all_kazaa())."
This commit is contained in:
Jan Engelhardt
2009-10-08 17:26:36 +02:00
parent 379e685b0f
commit 430723ece1
2 changed files with 8 additions and 1 deletions
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8
extensions/xt_ipp2p.c
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@@ -844,7 +844,13 @@ ipp2p_mt(const struct sk_buff *skb, const struct xt_match_param *par)
if (tcph->rst) return 0; /* if RST bit is set bail out */
haystack += tcph->doff * 4; /* get TCP-Header-Size */
hlen -= tcph->doff * 4;
if (tcph->doff * 4 > hlen) {
if (info->debug)
pr_info("TCP header indicated packet larger than it is\n");
hlen = 0;
} else {
hlen -= tcph->doff * 4;
}
while (matchlist[i].command) {
if ((info->cmd & matchlist[i].command) == matchlist[i].command &&
hlen > matchlist[i].packet_len)