Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Will push upstream in a moment
On Sat, 2022-10-29 at 15:46 +0800, Zheng Wang wrote:
> If it failed in kzalloc, vma will be freed in nvkm_vmm_node_merge.
> The later use of vma will casue use after free.
>
> Reported-by: Zheng Wang <hackerzheng666@xxxxxxxxx>
> Reported-by: Zhuorao Yang <alex000young@xxxxxxxxx>
>
> Fix it by returning to upper caller as soon as error occurs.
>
> Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
> ---
> drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c
> index ae793f400ba1..04befd28f80b 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/vmm.c
> @@ -1272,8 +1272,7 @@ nvkm_vmm_pfn_map(struct nvkm_vmm *vmm, u8 shift, u64 addr, u64 size, u64 *pfn)
> page -
> vmm->func->page, map);
> if (WARN_ON(!tmp)) {
> - ret = -ENOMEM;
> - goto next;
> + return -ENOMEM;
> }
>
> if ((tmp->mapped = map))
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
