diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a4d2856a4df1facc9150676e3cd06f38432f9bb1..aa914aaa00f8129bb0bb3744d4f0a1b13aa3f80b 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3327,11 +3327,13 @@ static void btrfs_cmp_data_free(struct cmp_pages *cmp)
 		if (pg) {
 			unlock_page(pg);
 			put_page(pg);
+			cmp->src_pages[i] = NULL;
 		}
 		pg = cmp->dst_pages[i];
 		if (pg) {
 			unlock_page(pg);
 			put_page(pg);
+			cmp->dst_pages[i] = NULL;
 		}
 	}
 }