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bus: moxtet: fix potential stack buffer overflow

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commit 3bf3c9744694803bd2d6f0ee70a6369b980530fd upstream.

The input_read function declares the size of the hex array relative to
sizeof(buf), but buf is a pointer argument of the function. The hex
array is meant to contain hexadecimal representation of the bin array.

Link: https://lore.kernel.org/r/20200215142130.22743-1-marek.behun@nic.cz
Fixes: 5bc7f990cd98 ("bus: Add support for Moxtet bus")
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reported-by: sohu0106 <sohu0106@126.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marek Behún 2020-02-15 15:21:30 +01:00 committed by Greg Kroah-Hartman
parent 279c15b917
commit fa3c053b83
1 changed files with 1 additions and 1 deletions
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2
drivers/bus/moxtet.c
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@ -466,7 +466,7 @@ static ssize_t input_read(struct file *file, char __user *buf, size_t len,
{
struct moxtet *moxtet = file->private_data;
u8 bin[TURRIS_MOX_MAX_MODULES];
u8 hex[sizeof(buf) * 2 + 1];
u8 hex[sizeof(bin) * 2 + 1];
int ret, n;
ret = moxtet_spi_read(moxtet, bin);