netdev - [PATCH 2/8 v2] textsearch: fix Boyer-Moore text search bug

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Date:	Wed, 25 Jun 2008 03:24:55 -0700
From:	Joonwoo Park <joonwpark81@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Joonwoo Park <joonwpark81@...il.com>
Subject: [PATCH 2/8 v2] textsearch: fix Boyer-Moore text search bug

The current logic has a bug which cannot find matching pattern, if the
pattern is matched from the first character of target string.
for example:
	pattern=abc, string=abcdefg
	pattern=a,   string=abcdefg
Searching algorithm should return 0 for those things.

Signed-off-by: Joonwoo Park <joonwpark81@...il.com>
---
 lib/ts_bm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/ts_bm.c b/lib/ts_bm.c
index d90822c..4a7fce7 100644
--- a/lib/ts_bm.c
+++ b/lib/ts_bm.c
@@ -63,7 +63,7 @@ static unsigned int bm_find(struct ts_config *conf, struct ts_state *state)
 	struct ts_bm *bm = ts_config_priv(conf);
 	unsigned int i, text_len, consumed = state->offset;
 	const u8 *text;
-	int shift = bm->patlen, bs;
+	int shift = bm->patlen - 1, bs;
 
 	for (;;) {
 		text_len = conf->get_next_block(consumed, &text, conf, state);
-- 
1.5.4.3

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