On 08/03/17 13:28, Peter Rosin wrote:
> Comparing a size_t with less than zero is always false as size_t
> is unsigned. So, change the type of the variable to ssize_t and
> replicate the size check from mux_configure_channel() into
> mux_write_ext_info() thus ensuring that the size will fit in the
> ssize_t variable.
>
> Detected by CoverityScan, CID#1415278 ("Unsigned compared against 0")
>
> Reported-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
For what it's worth, looks good to me.
Jonathan
> ---
> drivers/iio/multiplexer/iio-mux.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> Hi!
>
> Here's what intend to queue up.
>
> Cheers,
> peda
>
> diff --git a/drivers/iio/multiplexer/iio-mux.c b/drivers/iio/multiplexer/iio-mux.c
> index 94d40f9b..bab9e69 100644
> --- a/drivers/iio/multiplexer/iio-mux.c
> +++ b/drivers/iio/multiplexer/iio-mux.c
> @@ -21,7 +21,7 @@
>
> struct mux_ext_info_cache {
> char *data;
> - size_t size;
> + ssize_t size;
> };
>
> struct mux_child {
> @@ -206,6 +206,9 @@ static ssize_t mux_write_ext_info(struct iio_dev *indio_dev, uintptr_t private,
> char *new;
> ssize_t ret;
>
> + if (len >= PAGE_SIZE)
> + return -EINVAL;
> +
> ret = iio_mux_select(mux, idx);
> if (ret < 0)
> return ret;
>
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