linux-kernel - [PATCH 4.19 215/421] configfs: fix memleak in configfs_release_bin

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Date:   Mon, 19 Jul 2021 16:50:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chung-Chiang Cheng <cccheng@...ology.com>,
        Christoph Hellwig <hch@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 215/421] configfs: fix memleak in configfs_release_bin_file

From: Chung-Chiang Cheng <shepjeng@...il.com>

[ Upstream commit 3c252b087de08d3cb32468b54a158bd7ad0ae2f7 ]

When reading binary attributes in progress, buffer->bin_buffer is setup in
configfs_read_bin_file() but never freed.

Fixes: 03607ace807b4 ("configfs: implement binary attributes")
Signed-off-by: Chung-Chiang Cheng <cccheng@...ology.com>
[hch: move the vfree rather than duplicating it]
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/configfs/file.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index 50b7c4c4310e..38eb80e29715 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -496,13 +496,13 @@ static int configfs_release_bin_file(struct inode *inode, struct file *file)
 					buffer->bin_buffer_size);
 		}
 		up_read(&frag->frag_sem);
-		/* vfree on NULL is safe */
-		vfree(buffer->bin_buffer);
-		buffer->bin_buffer = NULL;
-		buffer->bin_buffer_size = 0;
-		buffer->needs_read_fill = 1;
 	}
 
+	vfree(buffer->bin_buffer);
+	buffer->bin_buffer = NULL;
+	buffer->bin_buffer_size = 0;
+	buffer->needs_read_fill = 1;
+
 	configfs_release(inode, file);
 	return 0;
 }
-- 
2.30.2