[TEXTSEARCH]: Fix Boyer Moore initialization bug

The pattern is set after trying to compute the prefix table, which tries
to use it. Initialize it before calling compute_prefix_tbl, make
compute_prefix_tbl consistently use only the data from struct ts_bm
and remove the now unnecessary arguments.

Signed-off-by: Michael Rash <mbr@cipherdyne.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 6 deletions

diff --git a/lib/ts_bm.c b/lib/ts_bm.c
index 0110e4414805..d90822c378a4 100644
--- a/lib/ts_bm.c
+++ b/lib/ts_bm.c
@@ -111,15 +111,14 @@ static int subpattern(u8 *pattern, int i, int j, int g)
         return ret;
 }
 
-static void compute_prefix_tbl(struct ts_bm *bm, const u8 *pattern,
-                               unsigned int len)
+static void compute_prefix_tbl(struct ts_bm *bm)
 {
         int i, j, g;
 
         for (i = 0; i < ASIZE; i++)
-                bm->bad_shift[i] = len;
-        for (i = 0; i < len - 1; i++)
-                bm->bad_shift[pattern[i]] = len - 1 - i;
+                bm->bad_shift[i] = bm->patlen;
+        for (i = 0; i < bm->patlen - 1; i++)
+                bm->bad_shift[bm->pattern[i]] = bm->patlen - 1 - i;
 
         /* Compute the good shift array, used to match reocurrences 
          * of a subpattern */
@@ -150,8 +149,8 @@ static struct ts_config *bm_init(const void *pattern, unsigned int len,
         bm = ts_config_priv(conf);
         bm->patlen = len;
         bm->pattern = (u8 *) bm->good_shift + prefix_tbl_len;
-        compute_prefix_tbl(bm, pattern, len);
         memcpy(bm->pattern, pattern, len);
+        compute_prefix_tbl(bm);
 
         return conf;
 }