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btrfs: use correct string length in DEV_INFO ioctl

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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 <xiongfeng.wang@linaro.org>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Xiongfeng Wang 2018-01-08 19:51:22 +08:00 committed by David Sterba
parent 6f794e3c5c
commit 6670d4c2d9
1 changed files with 1 additions and 1 deletions
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fs/btrfs/ioctl.c
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@ -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';