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xen/grants: prevent integer overflow in gnttab_dma_alloc_pages()

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[ Upstream commit e9ea0b30ada008f4e65933f449db6894832cb242 ]

The change from kcalloc() to kvmalloc() means that arg->nr_pages
might now be large enough that the "args->nr_pages << PAGE_SHIFT" can
result in an integer overflow.

Fixes: b3f7931f5c ("xen/gntdev: switch from kcalloc() to kvcalloc()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/YxDROJqu/RPvR0bi@kili
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter
2022-09-01 18:35:20 +03:00
committed by Greg Kroah-Hartman
parent eb0c614c42
commit 5d0d46e625
1 changed files with 3 additions and 0 deletions
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3
drivers/xen/grant-table.c
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@@ -981,6 +981,9 @@ int gnttab_dma_alloc_pages(struct gnttab_dma_alloc_args *args)
size_t size; size_t size;
int i, ret; int i, ret;
if (args->nr_pages < 0 || args->nr_pages > (INT_MAX >> PAGE_SHIFT))
return -ENOMEM;
size = args->nr_pages << PAGE_SHIFT; size = args->nr_pages << PAGE_SHIFT;
if (args->coherent) if (args->coherent)
args->vaddr = dma_alloc_coherent(args->dev, size, args->vaddr = dma_alloc_coherent(args->dev, size,