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regmap: qti-regmap-debugfs: use kzalloc() for read buffer allocation

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Change the kmalloc() call in regmap_read_debugfs() to kzalloc()
to avoid a corner case in which copy_to_user() could be called
with the contents of the 'buf' array unallocated.

Change-Id: I9899ff01e8482f68d72247466ecf8615b1d0d35f
Signed-off-by: David Collins <collinsd@codeaurora.org>
This commit is contained in:
David Collins 2021-03-02 15:47:32 -08:00 committed by David Collins
parent 99b3d7a114
commit ffa4280183
1 changed files with 2 additions and 2 deletions
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4
drivers/base/regmap/qti-regmap-debugfs.c
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@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2011 Wolfson Microelectronics plc
* Copyright (c) 2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
*/
#include <linux/debugfs.h>
@ -289,7 +289,7 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
if (count > (PAGE_SIZE << (MAX_ORDER - 1)))
count = PAGE_SIZE << (MAX_ORDER - 1);
buf = kmalloc(count, GFP_KERNEL);
buf = kzalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;