Hi Colin,
On Tue, Dec 20, 2016 at 10:07:50AM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> rmi_dev is currently being dereferenced before it null checked, so we
> have a potential null pointer dereference issue with this. Fix this
> by dereferencing rmi_dev after a null check has been performed.
>
> Fixes CoverityScan CID 1391218 ("Dereference before null check")
I'd rather we removed the NULL check instead. As far as I can see it
can't even be NULL.
>
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ---
> drivers/input/rmi4/rmi_f03.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/input/rmi4/rmi_f03.c b/drivers/input/rmi4/rmi_f03.c
> index 8a7ca3e..008f42a 100644
> --- a/drivers/input/rmi4/rmi_f03.c
> +++ b/drivers/input/rmi4/rmi_f03.c
> @@ -164,7 +164,7 @@ static int rmi_f03_config(struct rmi_function *fn)
> static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits)
> {
> struct rmi_device *rmi_dev = fn->rmi_dev;
> - struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
> + struct rmi_driver_data *drvdata;
> struct f03_data *f03 = dev_get_drvdata(&fn->dev);
> u16 data_addr = fn->fd.data_base_addr;
> const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
> @@ -178,6 +178,7 @@ static int rmi_f03_attention(struct rmi_function *fn, unsigned long *irq_bits)
> if (!rmi_dev)
> return -ENODEV;
>
> + drvdata = dev_get_drvdata(&rmi_dev->dev);
> if (drvdata->attn_data.data) {
> /* First grab the data passed by the transport device */
> if (drvdata->attn_data.size < ob_len) {
> --
> 2.10.2
>
Thanks.
--
Dmitry
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