On 14/10/2016 16:18, Chris Wilson wrote:
The scattergather list uses a 32bit size counter, we should avoid
exceeding it.
Fixes: 871dfbd67d4e ("drm/i915: Allow compaction upto SWIOTLB max segment size")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0d1dc04302ec..858569419134 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2238,7 +2238,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
max_segment = swiotlb_max_size();
if (!max_segment)
- max_segment = obj->base.size;
+ max_segment = rounddown(UINT_MAX, PAGE_SIZE);
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL)
I suppose it could be possible to get more that 4GiB of of contiguous pages.
sg_alloc_table_from_pages seems broken as well, for this, and more so,
for using longs and stuffing them into ints.
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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