1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 507081059d97..5908521922fb 100644
--- 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)