detect: use macro for max rule size

src/detect-parse.c

@@ -486,7 +486,7 @@ static int SigParseOptions(DetectEngineCtx *de_ctx, Signature *s, char *optstr,
     int ret = 0;
     SigTableElmt *st = NULL;
     char optname[64];
-    char optvalue[8192] = "";
+    char optvalue[DETECT_MAX_RULE_SIZE] = "";
 
     ret = pcre_exec(option_pcre, option_pcre_extra, optstr, strlen(optstr), 0, 0, ov, MAX_SUBSTRINGS);
     /* if successful, we either have:

src/detect.c

@@ -283,7 +283,7 @@ char *DetectLoadCompleteSigPath(char *sig_file)
 int DetectLoadSigFile(DetectEngineCtx *de_ctx, char *sig_file, int *sigs_tot) {
     Signature *sig = NULL;
     int good = 0, bad = 0;
-    char line[8192] = "";
+    char line[DETECT_MAX_RULE_SIZE] = "";
     size_t offset = 0;
     int lineno = 0, multiline = 0;
 

src/detect.h

@@ -44,6 +44,8 @@
 
 #define COUNTER_DETECT_ALERTS 1
 
+#define DETECT_MAX_RULE_SIZE 8192
+
 /* forward declarations for the structures from detect-engine-sigorder.h */
 struct SCSigOrderFunc_;
 struct SCSigSignatureWrapper_;