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agp: zero pages before sending to userspace 

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;