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agp: zero pages before sending to userspace

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AGP pages might be mapped into userspace finally, so the pages should be
set to zero before userspace can use it. Otherwise there is potential
information leakage.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Shaohua Li 2009-04-20 10:08:35 +10:00 committed by Dave Airlie
parent 07f1c7a7f6
commit 59de2bebab
1 changed files with 2 additions and 2 deletions
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4
drivers/char/agp/generic.c
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@ -1226,7 +1226,7 @@ int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *m
int i, ret = -ENOMEM;
for (i = 0; i < num_pages; i++) {
page = alloc_page(GFP_KERNEL | GFP_DMA32);
page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
/* agp_free_memory() needs gart address */
if (page == NULL)
goto out;
@ -1257,7 +1257,7 @@ void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
{
struct page * page;
page = alloc_page(GFP_KERNEL | GFP_DMA32);
page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
if (page == NULL)
return NULL;