On Tue, 29 May 2018 07:48:51 +0200, Oleksandr Andrushchenko wrote:

On 05/28/2018 06:59 PM, Arnd Bergmann wrote:

...

gcc-8 warns that pcm_instance->name is not necessarily terminated correctly if the input is more than 80 characters long or lacks a termination byte itself:

In function 'strncpy', inlined from 'cfg_device' at sound/xen/xen_snd_front_cfg.c:399:3, inlined from 'xen_snd_front_cfg_card' at sound/xen/xen_snd_front_cfg.c:509:9: include/linux/string.h:254:9: error: '__builtin_strncpy' specified bound 80 equals destination size [-Werror=stringop-truncation] return __builtin_strncpy(p, q, size);

Using strlcpy() instead of strncpy() makes this a bit safer.

Fixes: fd3b36045c2c ("ALSA: xen-front: Read sound driver configuration from Xen store") Signed-off-by: Arnd Bergmann arnd@arndb.de

---

sound/xen/xen_snd_front_cfg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/xen/xen_snd_front_cfg.c b/sound/xen/xen_snd_front_cfg.c index 38c7e1eefbb9..684b5f1d51ac 100644 --- a/sound/xen/xen_snd_front_cfg.c +++ b/sound/xen/xen_snd_front_cfg.c @@ -396,7 +396,7 @@ static int cfg_device(struct xen_snd_front_info *front_info, str = xenbus_read(XBT_NIL, device_path, XENSND_FIELD_DEVICE_NAME, NULL); if (!IS_ERR(str)) {

• strncpy(pcm_instance->name, str, sizeof(pcm_instance->name));
  

• strlcpy(pcm_instance->name, str, sizeof(pcm_instance->name));
  

  kfree(str); }

Thank you for your patch, Reviewed-by: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com

Applied now. Thanks.

Takashi