2nd try of fixing some bugs reported by static code analysis tool.

src/decode-gre.c

@@ -78,8 +78,7 @@ void DecodeGRE(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, u
             {
 
                 gsre = (GRESreHdr *)(pkt + header_len);
-
-                if(gsre == NULL)
+                if (gsre == NULL)
                     return;
 
                 while (1)
@@ -96,7 +95,8 @@ void DecodeGRE(ThreadVars *tv, DecodeThreadVars *dtv, Packet *p, uint8_t *pkt, u
 
                     header_len += gsre->sre_length;
                     gsre = (GRESreHdr *)(pkt + header_len);
-
+                    if (gsre == NULL)
+                        return;
                 }
             }
             break;

src/detect-flowbits.c

@@ -139,7 +139,11 @@ int DetectFlowbitSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
     int ov[MAX_SUBSTRINGS];
 
     ret = pcre_exec(parse_regex, parse_regex_study, rawstr, strlen(rawstr), 0, 0, ov, MAX_SUBSTRINGS);
-    if (ret > 1) {
+    if (ret != 2 && ret != 3) {
+        printf("ERROR: \"%s\" is not a valid setting for flowbits.\n", rawstr);
+        return -1;
+    }
+
     const char *str_ptr;
     res = pcre_get_substring((char *)rawstr, ov, MAX_SUBSTRINGS, 1, &str_ptr);
     if (res < 0) {
@@ -148,7 +152,7 @@ int DetectFlowbitSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
     }
     fb_cmd_str = (char *)str_ptr;
 
-        if (ret > 2) {
+    if (ret == 3) {
         res = pcre_get_substring((char *)rawstr, ov, MAX_SUBSTRINGS, 2, &str_ptr);
         if (res < 0) {
             printf("DetectPcreSetup: pcre_get_substring failed\n");
@@ -156,10 +160,6 @@ int DetectFlowbitSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
         }
         fb_name = (char *)str_ptr;
     }
-    } else {
-        printf("ERROR: \"%s\" is not a valid setting for flowbits.\n", rawstr);
-        return -1;
-    }
 
     if (strcmp(fb_cmd_str,"noalert") == 0) {
         fb_cmd = DETECT_FLOWBITS_CMD_NOALERT;
@@ -189,7 +189,11 @@ int DetectFlowbitSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
         goto error;
     }
 
+    if (fb_name != NULL) {
         cd->idx = VariableNameGetIdx(de_ctx,fb_name,DETECT_FLOWBITS);
+    } else {
+        cd->idx = 0;
+    }
     cd->cmd = fb_cmd;
     //printf("DetectFlowbitSetup: idx %" PRIu32 ", cmd %s, name %s\n", cd->idx, fb_cmd_str, fb_name ? fb_name : "(null)");
 

src/detect-flowvar.c

@@ -91,7 +91,11 @@ int DetectFlowvarSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
     int ov[MAX_SUBSTRINGS];
 
     ret = pcre_exec(parse_regex, parse_regex_study, rawstr, strlen(rawstr), 0, 0, ov, MAX_SUBSTRINGS);
-    if (ret > 1) {
+    if (ret != 3) {
+        printf("ERROR: \"%s\" is not a valid setting for flowvar.\n", rawstr);
+        return -1;
+    }
+
     const char *str_ptr;
     res = pcre_get_substring((char *)rawstr, ov, MAX_SUBSTRINGS, 1, &str_ptr);
     if (res < 0) {
@@ -108,12 +112,8 @@ int DetectFlowvarSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
         }
         varcontent = (char *)str_ptr;
     }
-    } else {
-        printf("ERROR: \"%s\" is not a valid setting for flowvar.\n", rawstr);
-        return -1;
-    }
 
-    printf("DetectFlowvarSetup: varname %s, varcontent %s\n", varname, varcontent);
+    //printf("DetectFlowvarSetup: varname %s, varcontent %s\n", varname, varcontent);
 
     if (varcontent[0] == '\"' && varcontent[strlen(varcontent)-1] == '\"') {
         str = strdup(varcontent+1);

src/detect-pktvar.c

@@ -85,7 +85,12 @@ int DetectPktvarSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
     int ov[MAX_SUBSTRINGS];
 
     ret = pcre_exec(parse_regex, parse_regex_study, rawstr, strlen(rawstr), 0, 0, ov, MAX_SUBSTRINGS);
-    if (ret > 1) {
+    if (ret != 3) {
+        printf("ERROR: \"%s\" is not a valid setting for pktvar.\n", rawstr);
+        return -1;
+
+    }
+
     const char *str_ptr;
     res = pcre_get_substring((char *)rawstr, ov, MAX_SUBSTRINGS, 1, &str_ptr);
     if (res < 0) {
@@ -102,10 +107,6 @@ int DetectPktvarSetup (DetectEngineCtx *de_ctx, Signature *s, SigMatch *m, char
         }
         varcontent = (char *)str_ptr;
     }
-    } else {
-        printf("ERROR: \"%s\" is not a valid setting for pktvar.\n", rawstr);
-        return -1;
-    }
 
     printf("DetectPktvarSetup: varname %s, varcontent %s\n", varname, varcontent);