On Wed, 22 Jul 2020 14:09:03 +0100, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> The pointer header is an alias to msg and msg is being null checked.
> However, if msg is null then header is also null and this can lead to
> a null pointer dereference on the assignment type = header->type. Fix
> this just using header->type after the null check and removing the need
> for type as it is only used once.
>
> Addresses-Coverity: ("Dereference before null check")
> Fixes: 3de16839669f ("media: allegro: add explicit mail encoding and decoding")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Reviewed-by: Michael Tretter <m.tretter@xxxxxxxxxxxxxx>
> ---
>
> V2: remove need for variable type, as suggested by Michael Tretter
>
> ---
> drivers/staging/media/allegro-dvt/allegro-mail.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/media/allegro-dvt/allegro-mail.c b/drivers/staging/media/allegro-dvt/allegro-mail.c
> index 4ac65de12463..9286d2162377 100644
> --- a/drivers/staging/media/allegro-dvt/allegro-mail.c
> +++ b/drivers/staging/media/allegro-dvt/allegro-mail.c
> @@ -462,13 +462,12 @@ allegro_dec_encode_frame(struct mcu_msg_encode_frame_response *msg, u32 *src)
> ssize_t allegro_encode_mail(u32 *dst, void *msg)
> {
> const struct mcu_msg_header *header = msg;
> - enum mcu_msg_type type = header->type;
> ssize_t size;
>
> if (!msg || !dst)
> return -EINVAL;
>
> - switch (type) {
> + switch (header->type) {
> case MCU_MSG_TYPE_INIT:
> size = allegro_enc_init(&dst[1], msg);
> break;
> --
> 2.27.0
>
>
