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From:   Niklas Cassel <niklas.cassel@linaro.org>
To:     Andy Gross <andy.gross@linaro.org>,
        David Brown <david.brown@linaro.org>
Cc:     Niklas Cassel <niklas.cassel@linaro.org>,
        linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v6 7/9] soc: qcom: wcnss_ctrl: Avoid string overflow
Date:   Wed, 29 Aug 2018 09:57:21 +0200
Message-Id: <20180829075724.9095-8-niklas.cassel@linaro.org>
In-Reply-To: <20180829075724.9095-1-niklas.cassel@linaro.org>
References: <20180829075724.9095-1-niklas.cassel@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

'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@linaro.org>
---
 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 df3ccb30bc2d..373400dd816d 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;
 
-- 
2.17.1