linux-kernel - [PATCH 3.2 41/94] jffs2: remove from wait queue after schedule()

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Date:	Mon, 28 Apr 2014 02:11:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Artem Bityutskiy" <artem.bityutskiy@...ux.intel.com>,
	"Brian Norris" <computersforpeace@...il.com>,
	"Li Zefan" <lizefan@...wei.com>,
	"David Woodhouse" <dwmw2@...radead.org>
Subject: [PATCH 3.2 41/94] jffs2: remove from wait queue after schedule()

3.2.58-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Li Zefan <lizefan@...wei.com>

commit 3ead9578443b66ddb3d50ed4f53af8a0c0298ec5 upstream.

@wait is a local variable, so if we don't remove it from the wait queue
list, later wake_up() may end up accessing invalid memory.

This was spotted by eyes.

Signed-off-by: Li Zefan <lizefan@...wei.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/jffs2/nodemgmt.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -128,6 +128,7 @@ int jffs2_reserve_space(struct jffs2_sb_
 					spin_unlock(&c->erase_completion_lock);
 
 					schedule();
+					remove_wait_queue(&c->erase_wait, &wait);
 				} else
 					spin_unlock(&c->erase_completion_lock);
 			} else if (ret)

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