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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 2/5] netfilter: nf_conntrack_ftp: Fix debug output
Date: Fri, 30 Aug 2019 14:07:01 +0200
Message-ID: <20190830120704.6147-3-pablo@netfilter.org> (raw)
In-Reply-To: <20190830120704.6147-1-pablo@netfilter.org>

From: Thomas Jarosch <thomas.jarosch@intra2net.com>

The find_pattern() debug output was printing the 'skip' character.
This can be a NULL-byte and messes up further pr_debug() output.

Output without the fix:
kernel: nf_conntrack_ftp: Pattern matches!
kernel: nf_conntrack_ftp: Skipped up to `<7>nf_conntrack_ftp: find_pattern `PORT': dlen = 8
kernel: nf_conntrack_ftp: find_pattern `EPRT': dlen = 8

Output with the fix:
kernel: nf_conntrack_ftp: Pattern matches!
kernel: nf_conntrack_ftp: Skipped up to 0x0 delimiter!
kernel: nf_conntrack_ftp: Match succeeded!
kernel: nf_conntrack_ftp: conntrack_ftp: match `172,17,0,100,200,207' (20 bytes at 4150681645)
kernel: nf_conntrack_ftp: find_pattern `PORT': dlen = 8

Signed-off-by: Thomas Jarosch <thomas.jarosch@intra2net.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_conntrack_ftp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 0ecb3e289ef2..8d96738b7dfd 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -322,7 +322,7 @@ static int find_pattern(const char *data, size_t dlen,
 		i++;
 	}
 
-	pr_debug("Skipped up to `%c'!\n", skip);
+	pr_debug("Skipped up to 0x%hhx delimiter!\n", skip);
 
 	*numoff = i;
 	*numlen = getnum(data + i, dlen - i, cmd, term, numoff);
-- 
2.11.0


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-30 12:06 [PATCH 0/5] Netfilter fixes for net Pablo Neira Ayuso
2019-08-30 12:07 ` [PATCH 1/5] netfilter: xt_physdev: Fix spurious error message in physdev_mt_check Pablo Neira Ayuso
2019-08-30 12:07 ` Pablo Neira Ayuso [this message]
2019-08-30 12:07 ` [PATCH 3/5] netfilter: conntrack: make sysctls per-namespace again Pablo Neira Ayuso
2019-08-30 12:07 ` [PATCH 4/5] netfilter: nf_flow_table: clear skb tstamp before xmit Pablo Neira Ayuso
2019-08-30 12:07 ` [PATCH 5/5] netfilter: nft_meta_bridge: Fix get NFT_META_BRI_IIFVPROTO in network byteorder Pablo Neira Ayuso
2019-08-31  0:52 ` [PATCH 0/5] Netfilter fixes for net David Miller

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