linux-kernel - [PATCH] debugfs: fix double unlock in open_proxy

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Message-Id: <1457795345-23014-1-git-send-email-nicstange@gmail.com>
Date:	Sat, 12 Mar 2016 16:09:05 +0100
From:	Nicolai Stange <nicstange@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org, Nicolai Stange <nicstange@...il.com>
Subject: [PATCH] debugfs: fix double unlock in open_proxy_open()

In case an open is racing with a debugfs file removal, the corresponding
error path in open_proxy_open() releases its SRCU read side critical
section twice, i.e. it does a double unlock.

Fix that by purging the extra unlock operation.

Signed-off-by: Nicolai Stange <nicstange@...il.com>
---
 fs/debugfs/file.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 6a4b667..9c1c9a0 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -108,7 +108,6 @@ static int open_proxy_open(struct inode *inode, struct file *filp)
 
 	r = debugfs_use_file_start(dentry, &srcu_idx);
 	if (r) {
-		debugfs_use_file_finish(srcu_idx);
 		r = -ENOENT;
 		goto out;
 	}
-- 
2.7.2