From 6670d4c2d9b7d352cbf90cd18c516bb6444acf34 Mon Sep 17 00:00:00 2001 From: Xiongfeng Wang Date: Mon, 8 Jan 2018 19:51:22 +0800 Subject: [PATCH] btrfs: use correct string length in DEV_INFO ioctl gcc-8 reports: fs/btrfs/ioctl.c: In function 'btrfs_ioctl': ./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified bound 1024 equals destination size [-Wstringop-truncation] We need one less byte or call strlcpy() to make it a nul-terminated string. This is done on the next line anyway, but we want to avoid the warning. Signed-off-by: Xiongfeng Wang Reviewed-by: David Sterba [ update changelog ] Signed-off-by: David Sterba --- fs/btrfs/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index f6d4d5810cc1..f573cad72b7e 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2798,7 +2798,7 @@ static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info, struct rcu_string *name; name = rcu_dereference(dev->name); - strncpy(di_args->path, name->str, sizeof(di_args->path)); + strncpy(di_args->path, name->str, sizeof(di_args->path) - 1); di_args->path[sizeof(di_args->path) - 1] = 0; } else { di_args->path[0] = '\0';