btrfs: switch to kcalloc in btrfs_cmp_data_prepare

Kcalloc is functionally equivalent and does overflow checks.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 55440a742594ebb40bd311dcc060f09149fc6402..11dae2a30eb5a71d496b52eeeb7eb11b519154d7 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2925,8 +2925,8 @@ static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
         * of the array is bounded by len, which is in turn bounded by
         * BTRFS_MAX_DEDUPE_LEN.
         */
-       src_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_KERNEL);
-       dst_pgarr = kzalloc(num_pages * sizeof(struct page *), GFP_KERNEL);
+       src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
+       dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
        if (!src_pgarr || !dst_pgarr) {
                kfree(src_pgarr);
                kfree(dst_pgarr);