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relay: use kvcalloc to alloc page array in relay_alloc_page_array 

kvcalloc() is safer because it will check the integer overflows, and using
it will simple the logic of allocation size.

Link: https://lkml.kernel.org/r/20220909101025.82955-1-wuchi.zero@gmail.com
Signed-off-by: wuchi <wuchi.zero@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
pull/520/merge
wuchi 2022-09-09 18:10:25 +08:00 committed by Andrew Morton
parent 7ec354baa2
commit 83d87a4ddb
1 changed files with 1 additions and 4 deletions
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5
kernel/relay.c
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@ -60,10 +60,7 @@ static const struct vm_operations_struct relay_file_mmap_ops = {
*/ */
static struct page **relay_alloc_page_array(unsigned int n_pages) static struct page **relay_alloc_page_array(unsigned int n_pages)
{ {
const size_t pa_size = n_pages * sizeof(struct page *); return kvcalloc(n_pages, sizeof(struct page *), GFP_KERNEL);
if (pa_size > PAGE_SIZE)
return vzalloc(pa_size);
return kzalloc(pa_size, GFP_KERNEL);
} }
/* /*