linux-kernel - [PATCH 3.4 26/27] jffs2: remove from wait queue after schedule()

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Message-Id: <20140424215552.760255639@linuxfoundation.org>
Date:	Thu, 24 Apr 2014 14:56:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brian Norris <computersforpeace@...il.com>
Subject: [PATCH 3.4 26/27] jffs2: remove from wait queue after schedule()

3.4-stable 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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/jffs2/nodemgmt.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -139,6 +139,7 @@ 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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