From 350eaf791bebccb9ad5999351f3e328319545f03 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Date: Tue, 6 Jan 2009 14:41:11 -0800
Subject: [PATCH] do_coredump(): check return from argv_split()

do_coredump() accesses helper_argv[0] without checking helper_argv !=
NULL.  This can happen if page allocation failed.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/exec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/exec.c b/fs/exec.c
index 6ca4e3d22a3..6b09d6fa4f7 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1770,6 +1770,11 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
 
  	if (ispipe) {
 		helper_argv = argv_split(GFP_KERNEL, corename+1, &helper_argc);
+		if (!helper_argv) {
+			printk(KERN_WARNING "%s failed to allocate memory\n",
+			       __func__);
+			goto fail_unlock;
+		}
 		/* Terminate the string before the first option */
 		delimit = strchr(corename, ' ');
 		if (delimit)