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netfilter: nf_conntrack_ftp: Fix debug output

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[ Upstream commit 3a069024d3 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Jarosch 2019-08-21 16:14:28 +02:00 • committed by Greg Kroah-Hartman
commit 6075729f76
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_conntrack_ftp.c
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@ -323,7 +323,7 @@ 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);