[PATCH] drm/bridge/sii8620: Fix memory corruption

[Andrzej Hajda]

On 21.08.2017 12:32, Maciej Purski wrote:
> Function sii8620_mt_read_devcap_reg_recv() used to read array index
> from a wrong msg register, which caused writing out of array
> bounds. It led to writing on other fields of struct sii8620.
>
> Signed-off-by: Maciej Purski <m.purski at samsung.com>
> Fixes: e9c6da270 ("drm/bridge/sii8620: add reading device capability
>        registers")
> ---

Queued to drm-misc-fixes.

Regards
Andrzej

>  drivers/gpu/drm/bridge/sil-sii8620.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
> index 2d51a22..5131bfb 100644
> --- a/drivers/gpu/drm/bridge/sil-sii8620.c
> +++ b/drivers/gpu/drm/bridge/sil-sii8620.c
> @@ -597,9 +597,9 @@ static void sii8620_mt_read_devcap(struct sii8620 *ctx, bool xdevcap)
>  static void sii8620_mt_read_devcap_reg_recv(struct sii8620 *ctx,
>  		struct sii8620_mt_msg *msg)
>  {
> -	u8 reg = msg->reg[0] & 0x7f;
> +	u8 reg = msg->reg[1] & 0x7f;
>  
> -	if (msg->reg[0] & 0x80)
> +	if (msg->reg[1] & 0x80)
>  		ctx->xdevcap[reg] = msg->ret;
>  	else
>  		ctx->devcap[reg] = msg->ret;