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b=H4sIAFSyDWUC/zWNwQrCMBAFf6Xs2YW6pYH6K+KhTV50QWLYlaKU/ rtB6GVgLjMbOUzhdOk2Mqzq+ipNzqeO4mMud7Cm5iS9DP0kwv62EuuXk+kKc34iHajDNApHDiH kmOcFWBK1UDVk/fwn19u+/wBIt94ddAAAAA== X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1695396437; l=1995; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=aH/Nw0wgXmPofMn8+msmli+1RTvUcNQ+NVlfyvVDvCQ=; b=ZWRxzHHGGdhrY8rSZAUGiKrWyLXM756BR/zKBvIX99dEWy6+GTHX00h/IgVVA6bNhrmDfH8cn 7IfSxl4KYjvBBbUfHKpbcjv9tL4vZ5rcDPVYRGc6Nfp33Bo/GSGKYLe X-Mailer: b4 0.12.3 Message-ID: <20230922-strncpy-drivers-leds-leds-lp3952-c-v1-1-4941d6f60ca4@google.com> Subject: [PATCH] leds: lp3952: replace deprecated strncpy with strscpy From: Justin Stitt To: Pavel Machek , Lee Jones Cc: linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on fry.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (fry.vger.email [0.0.0.0]); Fri, 22 Sep 2023 08:27:36 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777760767921450516 X-GMAIL-MSGID: 1777760767921450516 `strncpy` is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect `dest` to be NUL-terminated due to its use with dev_err. lp3952_get_label()'s dest argument is priv->leds[i].name: | acpi_ret = lp3952_get_label(&priv->client->dev, led_name_hdl[i], | priv->leds[i].name); ... which is then assigned to: | priv->leds[i].cdev.name = priv->leds[i].name; ... which is used with a format string | dev_err(&priv->client->dev, | "couldn't register LED %s\n", | priv->leds[i].cdev.name); There is no indication that NUL-padding is required but if it is let's opt for strscpy_pad. Considering the above, a suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- Note: build-tested only. --- drivers/leds/leds-lp3952.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 2cf0f715623872823a72e451243bbf555d10d032 change-id: 20230922-strncpy-drivers-leds-leds-lp3952-c-666fcfabeebd Best regards, -- Justin Stitt diff --git a/drivers/leds/leds-lp3952.c b/drivers/leds/leds-lp3952.c index 3bd55652a706..62ade3f05a87 100644 --- a/drivers/leds/leds-lp3952.c +++ b/drivers/leds/leds-lp3952.c @@ -101,7 +101,7 @@ static int lp3952_get_label(struct device *dev, const char *label, char *dest) if (ret) return ret; - strncpy(dest, str, LP3952_LABEL_MAX_LEN); + strscpy(dest, str, LP3952_LABEL_MAX_LEN); return 0; }