Commit 4b408c74 authored by Dan Carpenter's avatar Dan Carpenter Committed by Linus Torvalds

mm/gup_benchmark.c: prevent integer overflow in ioctl

The concern here is that "gup->size" is a u64 and "nr_pages" is unsigned
long.  On 32 bit systems we could trick the kernel into allocating fewer
pages than expected.

Link: http://lkml.kernel.org/r/20181025061546.hnhkv33diogf2uis@kili.mountain
Fixes: 64c349f4 ("mm: add infrastructure for get_user_pages_fast() benchmarking")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ec131b2d
...@@ -27,6 +27,9 @@ static int __gup_benchmark_ioctl(unsigned int cmd, ...@@ -27,6 +27,9 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
int nr; int nr;
struct page **pages; struct page **pages;
if (gup->size > ULONG_MAX)
return -EINVAL;
nr_pages = gup->size / PAGE_SIZE; nr_pages = gup->size / PAGE_SIZE;
pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL); pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
if (!pages) if (!pages)
......
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