On Friday 9 October 2020 20:51:01 CEST Kalle Valo wrote:
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>
>
> Jerome Pouiller <Jerome.Pouiller@xxxxxxxxxx> writes:
>
> > From: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
> >
> > Smatch complains:
> >
> > main.c:228 wfx_send_pdata_pds() warn: potential NULL parameter dereference 'tmp_buf'
> > 227 tmp_buf = kmemdup(pds->data, pds->size, GFP_KERNEL);
> > 228 ret = wfx_send_pds(wdev, tmp_buf, pds->size);
> > ^^^^^^^
> > 229 kfree(tmp_buf);
> >
> > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > Signed-off-by: Jérôme Pouiller <jerome.pouiller@xxxxxxxxxx>
> > ---
> > drivers/staging/wfx/main.c | 8 +++++++-
> > 1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
> > index df11c091e094..a8dc2c033410 100644
> > --- a/drivers/staging/wfx/main.c
> > +++ b/drivers/staging/wfx/main.c
> > @@ -222,12 +222,18 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
> > if (ret) {
> > dev_err(wdev->dev, "can't load PDS file %s\n",
> > wdev->pdata.file_pds);
> > - return ret;
> > + goto err1;
> > }
> > tmp_buf = kmemdup(pds->data, pds->size, GFP_KERNEL);
> > + if (!tmp_buf) {
> > + ret = -ENOMEM;
> > + goto err2;
> > + }
> > ret = wfx_send_pds(wdev, tmp_buf, pds->size);
> > kfree(tmp_buf);
> > +err2:
> > release_firmware(pds);
> > +err1:
> > return ret;
> > }
>
> A minor style issue but using more descriptive error labels make the
> code more readable and maintainable, especially in a bigger function.
> For example, err2 could be called err_release_firmware.
>
> And actually err1 could be removed and the goto replaced with just
> "return ret;". Then err2 could be renamed to a simple err.
It was the case in the initial code. However, I have preferred to not
mix 'return' and 'goto' inside the same function. Probably a matter of
taste.
Greg has already applied the series, but I don't forget this review. I
will take it into account in the series I am going to send you (probably
in the v2, in order to not defer the v1).
--
Jérôme Pouiller
