diff options
| author | Patrick McHardy <kaber@trash.net> | 2010-01-07 20:33:18 +0300 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2010-01-07 20:33:18 +0300 |
| commit | aaff23a95aea5f000895f50d90e91f1e2f727002 (patch) | |
| tree | 54b592b3a7f05517a6ce9854c07b7f5b959d36fb | |
| parent | 04bcef2a83f40c6db24222b27a52892cba39dffb (diff) | |
| download | linux-aaff23a95aea5f000895f50d90e91f1e2f727002.tar.xz | |
netfilter: nf_ct_ftp: fix out of bounds read in update_nl_seq()
As noticed by Dan Carpenter <error27@gmail.com>, update_nl_seq()
currently contains an out of bounds read of the seq_aft_nl array
when looking for the oldest sequence number position.
Fix it to only compare valid positions.
Cc: stable@kernel.org
Signed-off-by: Patrick McHardy <kaber@trash.net>
| -rw-r--r-- | net/netfilter/nf_conntrack_ftp.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c index 38ea7ef3ccd2..f0732aa18e4f 100644 --- a/net/netfilter/nf_conntrack_ftp.c +++ b/net/netfilter/nf_conntrack_ftp.c @@ -323,24 +323,24 @@ static void update_nl_seq(struct nf_conn *ct, u32 nl_seq, struct nf_ct_ftp_master *info, int dir, struct sk_buff *skb) { - unsigned int i, oldest = NUM_SEQ_TO_REMEMBER; + unsigned int i, oldest; /* Look for oldest: if we find exact match, we're done. */ for (i = 0; i < info->seq_aft_nl_num[dir]; i++) { if (info->seq_aft_nl[dir][i] == nl_seq) return; - - if (oldest == info->seq_aft_nl_num[dir] || - before(info->seq_aft_nl[dir][i], - info->seq_aft_nl[dir][oldest])) - oldest = i; } if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) { info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq; - } else if (oldest != NUM_SEQ_TO_REMEMBER && - after(nl_seq, info->seq_aft_nl[dir][oldest])) { - info->seq_aft_nl[dir][oldest] = nl_seq; + } else { + if (before(info->seq_aft_nl[dir][0], info->seq_aft_nl[dir][1])) + oldest = 0; + else + oldest = 1; + + if (after(nl_seq, info->seq_aft_nl[dir][oldest])) + info->seq_aft_nl[dir][oldest] = nl_seq; } } |