linux-kernel - [PATCH 34/52] netfilter: nf_ct_ftp: fix out of bounds read in update_nl

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Message-Id: <1263508051-7868-34-git-send-email-gregkh@suse.de>
Date:	Thu, 14 Jan 2010 14:27:13 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	Patrick McHardy <kaber@...sh.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 34/52] netfilter: nf_ct_ftp: fix out of bounds read in update_nl_seq()

From: Patrick McHardy <kaber@...sh.net>

commit aaff23a95aea5f000895f50d90e91f1e2f727002 upstream.

As noticed by Dan Carpenter <error27@...il.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.

Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 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 5509dd1..7dfd469 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;
 	}
 }
 
-- 
1.6.6

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