linux-kernel - [PATCH 4/5] compat_sys_clock_nanosleep: fix *rmtp handling for -EINTR case

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Message-ID: <20080201133803.GA25629@tv-sign.ru>
Date:	Fri, 1 Feb 2008 16:38:03 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Alexey Dobriyan <adobriyan@...ru>, Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...ru>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Toyo Abe <toyoa@...sta.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] compat_sys_clock_nanosleep: fix *rmtp handling for -EINTR case

COMPLETELY UNTESTED.

compat_sys_clock_nanosleep() update rmtp only if err == -ERESTART_RESTARTBLOCK.
This is wrong, nanosleep() can return -EINTR if flags & TIMER_ABSTIME.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- MM/kernel/compat.c~4_COMPAT_CLOCK	2008-02-01 14:50:01.000000000 +0300
+++ MM/kernel/compat.c	2008-02-01 15:05:28.000000000 +0300
@@ -618,8 +618,7 @@ static long compat_clock_nanosleep_resta
 	err = clock_nanosleep_restart(restart);
 	set_fs(oldfs);
 
-	if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
-	    put_compat_timespec(&tu, rmtp))
+	if (err && rmtp && put_compat_timespec(&tu, rmtp))
 		return -EFAULT;
 
 	if (err == -ERESTART_RESTARTBLOCK) {
@@ -648,8 +647,7 @@ long compat_sys_clock_nanosleep(clockid_
 				  (struct timespec __user *) &out);
 	set_fs(oldfs);
 
-	if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
-	    put_compat_timespec(&out, rmtp))
+	if (err && rmtp && put_compat_timespec(&out, rmtp))
 		return -EFAULT;
 
 	if (err == -ERESTART_RESTARTBLOCK) {

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