netdev - [RFC PATCH 06/12] debug: NULL pointer check in ip

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Message-Id: <1229352899-31330-7-git-send-email-patrick.ohly@intel.com>
Date:	Mon, 15 Dec 2008 15:54:53 +0100
From:	Patrick Ohly <patrick.ohly@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	John Stultz <johnstul@...ibm.com>, linux-api@...r.kernel.org,
	Patrick Ohly <patrick.ohly@...el.com>
Subject: [RFC PATCH 06/12] debug: NULL pointer check in ip_output


Signed-off-by: Patrick Ohly <patrick.ohly@...el.com>
---
 net/ipv4/ip_output.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index ed92f0b..03a6706 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -950,8 +950,14 @@ alloc_new_skb:
 			skb->ip_summed = csummode;
 			skb->csum = 0;
 			skb_reserve(skb, hh_len);
-			if (ipc->shtx.flags)
-				*skb_tx(skb) = ipc->shtx;
+			if (ipc->shtx.flags) {
+				if (skb_tx(skb)) 
+					*skb_tx(skb) = ipc->shtx;
+				else
+					printk(KERN_DEBUG
+						"ERROR: skb with flags %x and no tx ptr\n",
+						ipc->shtx.flags);
+			}
 
 			/*
 			 *	Find where to start putting bytes.
-- 
1.5.5.3

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