On 2022-10-17 21:27, Rafael Mendonca wrote:
If the number of pages from the userptr BO differs from the SG BO then the
allocated memory for the SG table doesn't get freed before returning
-EINVAL, which may lead to a memory leak in some error paths. Fix this by
checking the number of pages before allocating memory for the SG table.
Fixes: 264fb4d332f5 ("drm/amdgpu: Add multi-GPU DMA mapping helpers")
Signed-off-by: Rafael Mendonca <rafaelmendsr@xxxxxxxxx>
Thank you for catching this. The patch is
Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
I submitted it to our amd-staging-drm-next branch.
Regards,
Felix
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 978d3970b5cc..84f44f7e4111 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -510,13 +510,13 @@ kfd_mem_dmamap_userptr(struct kgd_mem *mem,
struct ttm_tt *ttm = bo->tbo.ttm;
int ret;
+ if (WARN_ON(ttm->num_pages != src_ttm->num_pages))
+ return -EINVAL;
+
ttm->sg = kmalloc(sizeof(*ttm->sg), GFP_KERNEL);
if (unlikely(!ttm->sg))
return -ENOMEM;
- if (WARN_ON(ttm->num_pages != src_ttm->num_pages))
- return -EINVAL;
-
/* Same sequence as in amdgpu_ttm_tt_pin_userptr */
ret = sg_alloc_table_from_pages(ttm->sg, src_ttm->pages,
ttm->num_pages, 0,
