linux-kernel - [PATCH] staging: lustre: Don't leak 'buffer' in cfs_get

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Message-ID: <alpine.LNX.2.00.1309302243050.4992@swampdragon.chaosbits.net>
Date:	Mon, 30 Sep 2013 22:44:37 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:	Andreas Dilger <andreas.dilger@...el.com>,
	Peng Tao <tao.peng@....com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, Nikita Danilov <nikita@...sterfs.com>
Subject: [PATCH] staging: lustre: Don't leak 'buffer' in cfs_get_environ()

If 'down_read_trylock' fails we'll curently leak the memory allocated to 'buffer'.
Fix the leak by simply kfree'ing 'buffer' before returning '-EDEADLK'.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 .../lustre/lustre/libcfs/linux/linux-curproc.c     |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c b/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c
index ea9e949..ecd031f 100644
--- a/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c
+++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c
@@ -227,8 +227,10 @@ int cfs_get_environ(const char *key, char *value, int *val_len)
 	 * which is already holding mmap_sem for writes.  If some other
 	 * thread gets the write lock in the meantime, this thread will
 	 * block, but at least it won't deadlock on itself.  LU-1735 */
-	if (down_read_trylock(&mm->mmap_sem) == 0)
+	if (down_read_trylock(&mm->mmap_sem) == 0) {
+		kfree(buffer);
 		return -EDEADLK;
+	}
 	up_read(&mm->mmap_sem);
 
 	addr = mm->env_start;
-- 
1.7.1


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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