linux-kernel - Re: [PATCH] crypto: qat - uninitialized variable in adf_hb_error_inject

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Date: Sat, 24 Feb 2024 08:50:31 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Damian Muszynski <damian.muszynski@...el.com>,
	Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Lucas Segarra Fernandez <lucas.segarra.fernandez@...el.com>,
	Tero Kristo <tero.kristo@...ux.intel.com>,
	Markas Rapoportas <markas.rapoportas@...el.com>,
	qat-linux@...el.com, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] crypto: qat - uninitialized variable in
 adf_hb_error_inject_write()

On Tue, Feb 13, 2024 at 09:09:41PM +0300, Dan Carpenter wrote:
> There are a few issues in this code.  If *ppos is non-zero then the
> first part of the buffer is not initialized.  We never initialize the
> last character of the buffer.  The return is not checked so it's
> possible that none of the buffer is initialized.
> 
> This is debugfs code which is root only and the impact of these bugs is
> very small.  However, it's still worth fixing.  To fix this:
> 1) Check that *ppos is zero.
> 2) Use copy_from_user() instead of simple_write_to_buffer().
> 3) Explicitly add a NUL terminator.
> 
> Fixes: e2b67859ab6e ("crypto: qat - add heartbeat error simulator")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  .../crypto/intel/qat/qat_common/adf_heartbeat_dbgfs.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt