linux-kernel - [34/70] futex: Set FLAGS_HAS_TIMEOUT during futex

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Date:	Tue, 19 Apr 2011 13:08:43 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Darren Hart <dvhart@...ux.intel.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	John Kacur <jkacur@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [34/70] futex: Set FLAGS_HAS_TIMEOUT during futex_wait restart setup

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Darren Hart <dvhart@...ux.intel.com>

commit 0cd9c6494ee5c19aef085152bc37f3a4e774a9e1 upstream.

The FLAGS_HAS_TIMEOUT flag was not getting set, causing the restart_block to
restart futex_wait() without a timeout after a signal.

Commit b41277dc7a18ee332d in 2.6.38 introduced the regression by accidentally
removing the the FLAGS_HAS_TIMEOUT assignment from futex_wait() during the setup
of the restart block. Restore the originaly behavior.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=32922

Reported-by: Tim Smith <tsmith201104@...oo.com>
Reported-by: Torsten Hilbrich <torsten.hilbrich@...unet.com>
Signed-off-by: Darren Hart <dvhart@...ux.intel.com>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: John Kacur <jkacur@...hat.com>
Link: http://lkml.kernel.org/r/%3Cdaac0eb3af607f72b9a4d3126b2ba8fb5ed3b883.1302820917.git.dvhart%40linux.intel.com%3E
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/futex.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1886,7 +1886,7 @@ retry:
 	restart->futex.val = val;
 	restart->futex.time = abs_time->tv64;
 	restart->futex.bitset = bitset;
-	restart->futex.flags = flags;
+	restart->futex.flags = flags | FLAGS_HAS_TIMEOUT;
 
 	ret = -ERESTART_RESTARTBLOCK;
 


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