Fixup calculation of the minimum scan pattern lenght in some cases.

src/util-mpm-b2g.c

@@ -392,8 +392,13 @@ static inline int B2gAddPattern(MpmCtx *mpm_ctx, uint8_t *pat, uint16_t patlen,
         //printf("\" cs \""); prt(p->cs,p->len);
         //printf("\"\n");
 
-        if (scan)
+        if (scan) {
             p->flags |= B2G_SCAN;
+
+            if (mpm_ctx->scan_maxlen < patlen) mpm_ctx->scan_maxlen = patlen;
+            if (mpm_ctx->scan_minlen == 0) mpm_ctx->scan_minlen = patlen;
+            else if (mpm_ctx->scan_minlen > patlen) mpm_ctx->scan_minlen = patlen;
+        }
     }
 
     /* we need a match */

src/util-mpm-b3g.c

@@ -371,8 +371,13 @@ static inline int B3gAddPattern(MpmCtx *mpm_ctx, uint8_t *pat, uint16_t patlen,
         /* if we're reusing a pattern, check we need to check that it is a
          * scan pattern if that is what we're adding. If so we set the pattern
          * to be a scan pattern. */
-        if (scan)
+        if (scan) {
             p->flags |= B3G_SCAN;
+
+            if (mpm_ctx->scan_maxlen < patlen) mpm_ctx->scan_maxlen = patlen;
+            if (mpm_ctx->scan_minlen == 0) mpm_ctx->scan_minlen = patlen;
+            else if (mpm_ctx->scan_minlen > patlen) mpm_ctx->scan_minlen = patlen;
+        }
     }
 
     /* we need a match */

src/util-mpm-wumanber.c

@@ -441,8 +441,12 @@ static inline int WmAddPattern(MpmCtx *mpm_ctx, uint8_t *pat, uint16_t patlen, u
         /* if we're reusing a pattern, check we need to check that it is a
          * scan pattern if that is what we're adding. If so we set the pattern
          * to be a scan pattern. */
-        if (scan)
+        if (scan) {
             p->flags = WUMANBER_SCAN;
+            if (mpm_ctx->scan_maxlen < patlen) mpm_ctx->scan_maxlen = patlen;
+            if (mpm_ctx->scan_minlen == 0) mpm_ctx->scan_minlen = patlen;
+            else if (mpm_ctx->scan_minlen > patlen) mpm_ctx->scan_minlen = patlen;
+        }
     }
 
     /* we need a match */