linux-kernel - [PATCH 3/3] jffs2: remove wait queue after schedule()

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Message-ID: <52F59365.5090001@huawei.com>
Date:	Sat, 8 Feb 2014 10:16:05 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>, <dwmw2@...radead.org>,
	<linux-mtd@...ts.infradead.org>
Subject: [PATCH 3/3] jffs2: remove wait queue after schedule()

@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.

Cc: <stable@...r.kernel.org>
Signed-off-by: Li Zefan <lizefan@...wei.com>
---
 fs/jffs2/nodemgmt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index fb30161..610a22c 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -179,6 +179,7 @@ int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
 					spin_unlock(&c->erase_completion_lock);
 
 					schedule();
+					remove_wait_queue(&c->erase_wait, &wait);
 				} else
 					spin_unlock(&c->erase_completion_lock);
 			} else if (ret)
-- 
1.8.0.2

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