Hi Christian,
> Am 21.03.25 um 17:41 schrieb Xiaogang.Chen:
> > From: Xiaogang Chen <xiaogang.c...@amd.com>
> >
> > by casting size_limit_mb to u64 when calculate pglimit.
> >
> > Signed-off-by: Xiaogang Chen<xiaogang.c...@amd.com>
>
> Reviewed-by: Christian König <christian.koe...@amd.com>
>
> If nobody objects I'm going to push that to drm-misc-fixes.
No objection but I wish the author would have added more details in the commit
message particularly the value they have used to trigger the overflow. I guess
Xiaogang can still comment here and briefly describe the exact
use-case/test-case
they are running where they encountered this issue.
Thanks,
Vivek
>
> Regards,
> Christian.
>
> > ---
> > drivers/dma-buf/udmabuf.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
> > index 8ce1f074c2d3..e99e3a65a470 100644
> > --- a/drivers/dma-buf/udmabuf.c
> > +++ b/drivers/dma-buf/udmabuf.c
> > @@ -398,7 +398,7 @@ static long udmabuf_create(struct miscdevice
> *device,
> > if (!ubuf)
> > return -ENOMEM;
> >
> > - pglimit = (size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
> > + pglimit = ((u64)size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
> > for (i = 0; i < head->count; i++) {
> > pgoff_t subpgcnt;
> >
