[PATCH] ab.c: check for invalid value for concurrency

[Mathihalli, Madhusudan]

Hi,
        If the "-c" option is given a arbitrarily huge value, ab dumps core.
(Try: ab -c 2147483647 http://foo.com/)

Here's a patch that limits the concurrency to MAX_CONCURRENCY (= 20000). The actual 
value of MAX_CONCURRENCY can be raised/lowered if you think the value is not 
appropriate.

Thanks
-Madhu

Index: ab.c
===================================================================
RCS file: /home/cvs/httpd-2.0/support/ab.c,v
retrieving revision 1.139
diff -u -r1.139 ab.c
--- ab.c        17 Mar 2004 00:06:44 -0000      1.139
+++ ab.c        17 Mar 2004 17:14:38 -0000
@@ -245,6 +245,7 @@
 
 #define ap_min(a,b) ((a)<(b))?(a):(b)
 #define ap_max(a,b) ((a)>(b))?(a):(b)
+#define MAX_CONCURRENCY 20000
 
 /* --------------------- GLOBALS ---------------------------- */
 
@@ -2158,6 +2159,11 @@
        usage(argv[0]);
     }
 
+    if ((concurrency < 0) || (concurrency > MAX_CONCURRENCY)) {
+       fprintf(stderr, "%s: Invalid Concurrency [Range 0..%d]\n",
+                argv[0], MAX_CONCURRENCY);
+        usage(argv[0];
+    }
 
     if ((heartbeatres) && (requests > 150)) {
        heartbeatres = requests / 10;   /* Print line every 10% of requests */