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Date: Tue, 15 Sep 2020 18:14:42 +0100 From: Colin Ian King <colin.king@...onical.com> To: Sean Young <sean@...s.org> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, Maxim Levitsky <maximlevitsky@...il.com>, linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] media: rc: fix check on dev->min_timeout for LIRC_GET_MIN_TIMEOUT ioctl On 15/09/2020 18:12, Sean Young wrote: > On Tue, Sep 15, 2020 at 04:36:08PM +0100, Colin King wrote: >> From: Colin Ian King <colin.king@...onical.com> >> >> Currently the LIRC_GET_MIN_TIMEOUT is checking for a null dev->max_timeout >> and then accessing dev->min_timeout, hence we may have a potential null >> pointer dereference issue. This looks like a cut-n-paste typo, fix it >> by checking on dev->min_timeout before accessing it. > > max_timeout and min_timeout are both u32, not pointers. So, the commit > message is wrong: there is no null pointer dereference issue. > > Every driver which has max_timeout also has min_timeout set (I've checked > for this). So technically this is not wrong, but maybe it looks wrong? Oops. I totally misread the analysis report. My bad. > > Thanks, > > Sean >> >> Addresses-Coverity: ("Copy-paste error") >> Fixes: e589333f346b ("V4L/DVB: IR: extend interfaces to support more device settings") >> Signed-off-by: Colin Ian King <colin.king@...onical.com> >> --- >> drivers/media/rc/lirc_dev.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c >> index 220363b9a868..d230c21e1d31 100644 >> --- a/drivers/media/rc/lirc_dev.c >> +++ b/drivers/media/rc/lirc_dev.c >> @@ -533,7 +533,7 @@ static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) >> >> /* Generic timeout support */ >> case LIRC_GET_MIN_TIMEOUT: >> - if (!dev->max_timeout) >> + if (!dev->min_timeout) >> ret = -ENOTTY; >> else >> val = dev->min_timeout; >> -- >> 2.27.0
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