Btrfs: Fix memset length in btrfs_file_write

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 5070810..5908521 100644 (file)
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1094,7 +1094,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
                                        PAGE_CACHE_SHIFT;
 
                WARN_ON(num_pages > nrptrs);
-               memset(pages, 0, sizeof(pages));
+               memset(pages, 0, sizeof(struct page *) * nrptrs);
 
                ret = btrfs_check_free_space(root, write_bytes, 0);
                if (ret)