linux-kernel - [PATCH] sys_waitid: return -EFAULT for NULL

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Date:	Tue, 13 Jan 2009 14:49:41 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	mtk.manpages@...il.com,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"Ulrich Drepper" <drepper@...hat.com>,
	"Vegard Nossum" <vegard.nossum@...il.com>,
	"linux-man@...r.kernel.org" <linux-man@...r.kernel.org>
Subject: [PATCH] sys_waitid: return -EFAULT for NULL

It's always been invalid to call waitid() with a NULL pointer.  It was an
oversight that it was allowed (and acts like a wait4() call instead).

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 kernel/exit.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index c7740fa..fa25790 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1760,6 +1760,8 @@ asmlinkage long sys_waitid(int which, pid_t upid,
 	enum pid_type type;
 	long ret;
 
+	if (unlikely(!infop))
+		return -EFAULT;
 	if (options & ~(WNOHANG|WNOWAIT|WEXITED|WSTOPPED|WCONTINUED))
 		return -EINVAL;
 	if (!(options & (WEXITED|WSTOPPED|WCONTINUED)))
--
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