netdev - [patch 10/10] forcedeth: work around NULL skb dereference crash

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Date:	Mon, 26 Mar 2007 21:47:29 -0800
From:	akpm@...ux-foundation.org
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org, mingo@...e.hu,
	aabdulla@...dia.com
Subject: [patch 10/10] forcedeth: work around NULL skb dereference crash

From: Ingo Molnar <mingo@...e.hu>

work around a NULL skb dereference crash that occurs during high load.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Cc: Ayaz Abdulla <aabdulla@...dia.com>
Cc: Jeff Garzik <jeff@...zik.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/net/forcedeth.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff -puN drivers/net/forcedeth.c~forcedeth-work-around-null-skb-dereference-crash drivers/net/forcedeth.c
--- a/drivers/net/forcedeth.c~forcedeth-work-around-null-skb-dereference-crash
+++ a/drivers/net/forcedeth.c
@@ -1902,6 +1902,16 @@ static void nv_tx_done(struct net_device
 						np->stats.tx_carrier_errors++;
 					np->stats.tx_errors++;
 				} else {
+					if (!np->get_tx_ctx->skb) {
+						printk("get_tx: %td, put_tx: "
+							"%td\n",
+							np->get_tx_ctx -
+							    np->first_tx_ctx,
+							np->put_tx_ctx -
+							    np->first_tx_ctx);
+						WARN_ON(1);
+						break;
+					}
 					np->stats.tx_packets++;
 					np->stats.tx_bytes += np->get_tx_ctx->skb->len;
 				}
@@ -1917,6 +1927,16 @@ static void nv_tx_done(struct net_device
 						np->stats.tx_carrier_errors++;
 					np->stats.tx_errors++;
 				} else {
+					if (!np->get_tx_ctx->skb) {
+						printk("get_tx: %td, put_tx: "
+							"%td\n",
+							np->get_tx_ctx -
+							    np->first_tx_ctx,
+							np->put_tx_ctx -
+							    np->first_tx_ctx);
+						WARN_ON(1);
+						break;
+					}
 					np->stats.tx_packets++;
 					np->stats.tx_bytes += np->get_tx_ctx->skb->len;
 				}
_
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