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[media] v4l2: vb2-dma-sg: fix potential security hole 

Memory allocated by alloc_page() function might contain some potentially
important data from other system processes. The patch adds a flag to
zero the allocated page before giving it to videobuf2 (and then to
userspace).

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andrzej Pietrasiewicz 2011-03-02 09:12:13 -03:00 committed by Mauro Carvalho Chehab
parent 72f1fc33a7
commit 941f896071
1 changed files with 1 additions and 1 deletions
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2
drivers/media/video/videobuf2-dma-sg.c
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@ -62,7 +62,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size)
goto fail_pages_array_alloc; goto fail_pages_array_alloc;
for (i = 0; i < buf->sg_desc.num_pages; ++i) { for (i = 0; i < buf->sg_desc.num_pages; ++i) {
buf->pages[i] = alloc_page(GFP_KERNEL); buf->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (NULL == buf->pages[i]) if (NULL == buf->pages[i])
goto fail_pages_alloc; goto fail_pages_alloc;
sg_set_page(&buf->sg_desc.sglist[i], sg_set_page(&buf->sg_desc.sglist[i],