Messages in this thread | | | Date | Thu, 24 Aug 2023 13:46:59 +0200 | From | Greg KH <> | Subject | Re: [PATCH v3] media: gspca: UBSAN: shift-out-of-bounds in set_flicker |
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On Thu, Aug 24, 2023 at 02:27:31PM +0530, coolrrsh@gmail.com wrote: > From: Rajeshwar R Shinde <coolrrsh@gmail.com> > > Syzkaller reported the following issue: > > UBSAN: shift-out-of-bounds in drivers/media/usb/gspca/cpia1.c:1031:27 > shift exponent 245 is too large for 32-bit type 'int' > > When the value of the variable "sd->params.exposure.gain" exceeds the > number of bits in an int, a shift-out-of-bounds error occurs. The error is > generated when the variable "currentexp" is left-shifted by more than 31 > bits. In order to confirm the range is valid, the conditional expression > was added. > > Reported-by: syzbot+e27f3dbdab04e43b9f73@syzkaller.appspotmail.com > Closes: https://lore.kernel.org/all/20230818164522.12806-1-coolrrsh@gmail.com > Link: https://syzkaller.appspot.com/bug?extid=e27f3dbdab04e43b9f73 > Signed-off-by: Rajeshwar R Shinde <coolrrsh@gmail.com>
You have loads of trailing whitespace, please fix your editor to not do that.
> --- > v1->v2 > Changed the patch
In what way? Be specific.
> v2->v3 > Changed the commit message
Again, be specific please. Otherwise all changes could be listed with these two sentances and that helps none of us out :(
> --- > drivers/media/usb/gspca/cpia1.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/media/usb/gspca/cpia1.c b/drivers/media/usb/gspca/cpia1.c > index 46ed95483e22..dafc522d5e7b 100644 > --- a/drivers/media/usb/gspca/cpia1.c > +++ b/drivers/media/usb/gspca/cpia1.c > @@ -1028,6 +1028,8 @@ static int set_flicker(struct gspca_dev *gspca_dev, int on, int apply) > sd->params.exposure.expMode = 2; > sd->exposure_status = EXPOSURE_NORMAL; > } > + if (sd->params.exposure.gain > 31) > + return -1;
Why is this still -1?
greg k-h
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