On 07/31/2018 10:02 AM, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> Currently when the allocation of gntdev_dmabuf fails, the error exit
> path will call dmabuf_imp_free_storage and causes a null pointer
> dereference on gntdev_dmabuf. Fix this by adding an error exit path
> that won't free gntdev_dmabuf.
>
> Detected by CoverityScan, CID#1472124 ("Dereference after null check")
>
> Fixes: bf8dc55b1358 ("xen/gntdev: Implement dma-buf import functionality")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Applied to for-linus-4.19.
> ---
> drivers/xen/gntdev-dmabuf.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
> index 744cfe9b0311..cba6b586bfbd 100644
> --- a/drivers/xen/gntdev-dmabuf.c
> +++ b/drivers/xen/gntdev-dmabuf.c
> @@ -568,7 +568,7 @@ static struct gntdev_dmabuf *dmabuf_imp_alloc_storage(int count)
>
> gntdev_dmabuf = kzalloc(sizeof(*gntdev_dmabuf), GFP_KERNEL);
> if (!gntdev_dmabuf)
> - goto fail;
> + goto fail_no_free;
>
> gntdev_dmabuf->u.imp.refs = kcalloc(count,
> sizeof(gntdev_dmabuf->u.imp.refs[0]),
> @@ -591,6 +591,7 @@ static struct gntdev_dmabuf *dmabuf_imp_alloc_storage(int count)
>
> fail:
> dmabuf_imp_free_storage(gntdev_dmabuf);
> +fail_no_free:
> return ERR_PTR(-ENOMEM);
> }
>
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