[PATCH AUTOSEL 4.19 176/205] soc: qcom: wcnss_ctrl: Avoid string overflow

[Sasha Levin]

From: Niklas Cassel <niklas.cassel@xxxxxxxxxx>

[ Upstream commit 4c96ed170d658d8826d94edec8ac93ee777981a2 ]

'chinfo.name' is used as a NUL-terminated string, but using strncpy() with
the length equal to the buffer size may result in lack of the termination:

drivers//soc/qcom/wcnss_ctrl.c: In function 'qcom_wcnss_open_channel':
drivers//soc/qcom/wcnss_ctrl.c:284:2: warning: 'strncpy' specified bound 32 equals destination size [-Wstringop-truncation]
  strncpy(chinfo.name, name, sizeof(chinfo.name));
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This changes it to use the safer strscpy() instead.

Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Andy Gross <andy.gross@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/soc/qcom/wcnss_ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/wcnss_ctrl.c b/drivers/soc/qcom/wcnss_ctrl.c
index df3ccb30bc2dd..373400dd816d6 100644
--- a/drivers/soc/qcom/wcnss_ctrl.c
+++ b/drivers/soc/qcom/wcnss_ctrl.c
@@ -281,7 +281,7 @@ struct rpmsg_endpoint *qcom_wcnss_open_channel(void *wcnss, const char *name, rp
 	struct rpmsg_channel_info chinfo;
 	struct wcnss_ctrl *_wcnss = wcnss;
 
-	strncpy(chinfo.name, name, sizeof(chinfo.name));
+	strscpy(chinfo.name, name, sizeof(chinfo.name));
 	chinfo.src = RPMSG_ADDR_ANY;
 	chinfo.dst = RPMSG_ADDR_ANY;
 
-- 
2.20.1