linux-kernel - [PATCH] eCryptFS: fix imbalanced mutex locking

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Message-ID: <20080510084509.GA6872@cvg>
Date:	Sat, 10 May 2008 12:45:09 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Michael A. Halcrow" <mhalcrow@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] eCryptFS: fix imbalanced mutex locking

Fix imbalanced calls for mutex lock/unlock on ecryptfs_daemon_hash_mux

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---

Revealed by Ingo Molnar: http://lkml.org/lkml/2008/5/7/260

Please test and rewview

Index: linux-2.6.git/fs/ecryptfs/miscdev.c
===================================================================
--- linux-2.6.git.orig/fs/ecryptfs/miscdev.c	2008-04-29 22:56:53.000000000 +0400
+++ linux-2.6.git/fs/ecryptfs/miscdev.c	2008-05-10 12:40:22.000000000 +0400
@@ -257,12 +257,14 @@ ecryptfs_miscdev_read(struct file *file,
 	mutex_lock(&daemon->mux);
 	if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
 		rc = 0;
+		mutex_unlock(&ecryptfs_daemon_hash_mux);
 		printk(KERN_WARNING "%s: Attempt to read from zombified "
 		       "daemon\n", __func__);
 		goto out_unlock_daemon;
 	}
 	if (daemon->flags & ECRYPTFS_DAEMON_IN_READ) {
 		rc = 0;
+		mutex_unlock(&ecryptfs_daemon_hash_mux);
 		goto out_unlock_daemon;
 	}
 	/* This daemon will not go away so long as this flag is set */
--
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