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Subject[PATCH 3.12 186/212] drm/radeon/vm: dont attempt to update ptes if ib allocation fails
3.12-stable review patch.  If anyone has any objections, please let me know.


From: Alex Deucher <>

commit 4cc948b94a222c310ae089c36718aac7a03aec90 upstream.

If we fail to allocate an indirect buffer (ib) when updating
the ptes, return an error instead of trying to use the ib.
Avoids a null pointer dereference.


v2 (chk): rebased on drm-fixes-3.12 for stable inclusion

Reviewed-by: Christian König <>
Signed-off-by: Alex Deucher <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/gpu/drm/radeon/radeon_gart.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -1156,6 +1156,8 @@ int radeon_vm_bo_update_pte(struct radeo
return -ENOMEM;

r = radeon_ib_get(rdev, ridx, &ib, NULL, ndw * 4);
+ if (r)
+ return r;
ib.length_dw = 0;

r = radeon_vm_update_pdes(rdev, vm, &ib, bo_va->soffset, bo_va->eoffset);

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