From cc9a2c8301683f73b7e0d1fc2cb5159110f3469f Mon Sep 17 00:00:00 2001
From: Julia Lawall <julia@diku.dk>
Date: Mon, 30 Nov 2009 15:38:19 -0500
Subject: [PATCH] arch/alpha/kernel: Add kmalloc NULL tests

Check that the result of kmalloc is not NULL before passing it to other
functions.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Matt Turner <mattst88@gmail.com>
---
 arch/alpha/kernel/core_marvel.c | 2 ++
 arch/alpha/kernel/core_titan.c  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/arch/alpha/kernel/core_marvel.c b/arch/alpha/kernel/core_marvel.c
index 8e059e58b0ac..53dd2f1a53aa 100644
--- a/arch/alpha/kernel/core_marvel.c
+++ b/arch/alpha/kernel/core_marvel.c
@@ -1103,6 +1103,8 @@ marvel_agp_info(void)
 	 * Allocate the info structure.
 	 */
 	agp = kmalloc(sizeof(*agp), GFP_KERNEL);
+	if (!agp)
+		return NULL;
 
 	/*
 	 * Fill it in.
diff --git a/arch/alpha/kernel/core_titan.c b/arch/alpha/kernel/core_titan.c
index 76686497b1e2..219bf271c0ba 100644
--- a/arch/alpha/kernel/core_titan.c
+++ b/arch/alpha/kernel/core_titan.c
@@ -757,6 +757,8 @@ titan_agp_info(void)
 	 * Allocate the info structure.
 	 */
 	agp = kmalloc(sizeof(*agp), GFP_KERNEL);
+	if (!agp)
+		return NULL;
 
 	/*
 	 * Fill it in.
-- 
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