Subject: [Fwd: PATCH pktgen hang, memleak, fixes]

From: Jeff Garzik <[email-masked]>
Date: Thu, 10 Jul 2003 13:40:53 -0400

Subject: PATCH pktgen hang, memleak, fixes
From: "Kambo Lohan" <[email-masked]>
To: [email-masked]
Date: Thu, 10 Jul 2003 11:22:24 -0400

This should fix about 3 things.  My first patch, be gentle...

2.5 has the same problem but I do not know if this will apply or not, we run 
2.4.

--- linux-2.4.21/net/core/pktgen.c	2002-11-28 18:53:15.000000000 -0500
+++ linux-2.4-kjp/net/core/pktgen.c	2003-07-10 11:08:31.000000000 -0400
@@ -34,6 +34,7 @@
  *   *  The new changes seem to have a performance impact of around 1%,
  *       as far as I can tell.
  *   --Ben Greear <[email-masked]>
+ * Fix refcount off by one if first packet fails, potential null deref, 
memleak 030710- KJP
  *
  * Renamed multiskb to clone_skb and cleaned up sending core for two 
distinct
  * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
@@ -84,9 +85,9 @@
#define cycles()	((u32)get_cycles())

-#define VERSION "pktgen version 1.2"
+#define VERSION "pktgen version 1.2.1"
static char version[] __initdata =
-  "pktgen.c: v1.2: Packet Generator for packet performance testing.\n";
+  "pktgen.c: v1.2.1: Packet Generator for packet performance testing.\n";

/* Used to help with determining the pkts on receive */

@@ -613,12 +614,11 @@
                                 kfree_skb(skb);
                                 skb = fill_packet(odev, info);
                                 if (skb == NULL) {
-                                        break;
+					goto out_reldev;
                                 }
                                 fp++;
                                 fp_tmp = 0; /* reset counter */
                         }
-                        atomic_inc(&skb->users);
                 }

                 nr_frags = skb_shinfo(skb)->nr_frags;
@@ -634,9 +634,10 @@
				last_ok = 0;
			}
                         else {
-		           last_ok = 1;
-                           info->sofar++;
-                           info->seq_num++;
+				atomic_inc(&skb->users);
+				last_ok = 1;
+				info->sofar++;
+				info->seq_num++;
                         }
		}
		else {
@@ -707,6 +708,7 @@
		}
	}/* while we should be running */

+
	do_gettimeofday(&(info->stopped_at));

	total = (info->stopped_at.tv_sec - info->started_at.tv_sec) * 1000000 +
@@ -731,6 +733,8 @@
			     (unsigned long long) info->errors
			     );
	}
+
+	kfree_skb(skb);

out_reldev:
         if (odev) {

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