[PATCH] udmabuf: fix a buf size overflow issue during udmabuf creation

[Christian König]

Am 21.03.25 um 17:41 schrieb Xiaogang.Chen:
> From: Xiaogang Chen <xiaogang.chen at amd.com>
>
> by casting size_limit_mb to u64  when calculate pglimit.
>
> Signed-off-by: Xiaogang Chen<Xiaogang.Chen at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

If nobody objects I'm going to push that to drm-misc-fixes.

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;
>