linux-kernel - Re: [PATCH] staging: r8188eu: fix memleak in rtw_wx_set_enc

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Message-ID: <20211107145359.immx5fbbzksj3ddb@viti.kaiser.cx>
Date:   Sun, 7 Nov 2021 15:53:59 +0100
From:   Martin Kaiser <martin@...ser.cx>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: fix memleak in rtw_wx_set_enc_ext

Thus wrote Dan Carpenter (dan.carpenter@...cle.com):

> On Tue, Oct 19, 2021 at 10:23:56PM +0200, Martin Kaiser wrote:
> > Free the param struct if the caller sets an unsupported algorithm
> > and we return an error.

> > Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
> > Signed-off-by: Martin Kaiser <martin@...ser.cx>
> > ---
> >  drivers/staging/r8188eu/os_dep/ioctl_linux.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)

> > diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> > index 4f0ae821d193..4e51d5a55985 100644
> > --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> > +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> > @@ -1897,7 +1897,7 @@ static int rtw_wx_set_enc_ext(struct net_device *dev,
> >  	struct ieee_param *param = NULL;
> >  	struct iw_point *pencoding = &wrqu->encoding;
> >  	struct iw_encode_ext *pext = (struct iw_encode_ext *)extra;
> > -	int ret = 0;
> > +	int ret = -1;


> This was in the original code, so it's fine to leave it as -1, but in
> future patches could you change it to -EINVAL instead.  (Or don't.  I'm
> not your boss.  I appretiate all the clean up you have done to this
> driver).

Thanks.

I tried to change as little as possible to allow for backporting to
stable.

Using a standard error code makes more sense. Some of the ioctl
functions do this already, others use -1. This is something we should
fix when cfg80211 support is in place and we know which of the ioctl
functions survive.

Best regards,
Martin