On Fri, Sep 02, 2022 at 11:42:41PM +0530, Gautam Menghani wrote:
> On Sun, Aug 14, 2022 at 07:55:42PM +0530, Gautam Menghani wrote:
> > The warning "URB submitted while active" is reported if the function
> > send_packet() in imon.c is called if a write is already is in progress.
> > Add a check to return -EBUSY in case a write is already is in progress.
> > Also, mark tx.busy as false after transmission is completed.
> >
> > Fixes: 21677cfc562a ("V4L/DVB: ir-core: add imon driver")
> > Cc: hdanton@xxxxxxxx
> > Suggested-by: hdanton@xxxxxxxx
> > Link: https://syzkaller.appspot.com/bug?id=e378e6a51fbe6c5cc43e34f131cc9a315ef0337e
> > Reported-by: syzbot+0c3cb6dc05fbbdc3ad66@xxxxxxxxxxxxxxxxxxxxxxxxx
> > Signed-off-by: Gautam Menghani <gautammenghani201@xxxxxxxxx>
> > ---
> > drivers/media/rc/imon.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
> > index 735b925da998..a5b997c2c7e2 100644
> > --- a/drivers/media/rc/imon.c
> > +++ b/drivers/media/rc/imon.c
> > @@ -598,6 +598,8 @@ static int send_packet(struct imon_context *ictx)
> > int retval = 0;
> > struct usb_ctrlrequest *control_req = NULL;
> >
> > + if (ictx->tx.busy)
> > + return -EBUSY;
> > /* Check if we need to use control or interrupt urb */
> > if (!ictx->tx_control) {
> > pipe = usb_sndintpipe(ictx->usbdev_intf0,
> > @@ -654,6 +656,7 @@ static int send_packet(struct imon_context *ictx)
> > pr_err_ratelimited("task interrupted\n");
> > }
> > mutex_lock(&ictx->lock);
> > + ictx->tx.busy = false;
> >
> > retval = ictx->tx.status;
> > if (retval)
> > --
> > 2.34.1
> >
> Hi,
>
> Please review the above fix and let me know if any changes are needed.
Greg has pointed out issues with this patch: there is no locking.
Thanks,
Sean
