Re: [PATCH] drm/ttm: fix null-ptr-deref in radeon_ttm_tt_populate()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





Am 17.04.23 um 16:34 schrieb Nikita Zhandarovich:
Currently, drm_prime_sg_to_page_addr_arrays() dereferences 'gtt->ttm'
without ensuring that 'gtt' (and therefore 'gtt->tmm') is not NULL.

Fix this by testing 'gtt' for NULL value before dereferencing.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 40f5cf996991 ("drm/radeon: add PRIME support (v2)")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx>
---
  drivers/gpu/drm/radeon/radeon_ttm.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 1e8e287e113c..33d01c3bdee4 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -553,7 +553,7 @@ static int radeon_ttm_tt_populate(struct ttm_device *bdev,
  		return 0;
  	}
- if (slave && ttm->sg) {
+	if (gtt && slave && ttm->sg) {

The gtt variable is derived from the ttm variable and so never NULL here. The only case when this can be NULL is for AGP and IIRC we don't support DMA-buf in this case.

  		drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,

Just use ttm->dma_addresses instead of gtt->ttm.dma_address here to make your automated checker happy.

Regards,
Christian.

  					       ttm->num_pages);
  		return 0;




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux