From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8643A33EC for ; Mon, 16 Jan 2023 15:54:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01C16C433D2; Mon, 16 Jan 2023 15:54:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673884450; bh=z0wSYaycW+TsNEC5o6aMzEGAU9pzWzENPsa1/1DLLGw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rFDftzoseNElioiwsnY09r+64ELFNS8prC8v0pnV2KaIRL30eMxYWcB6eMLdhmxy5 AxXPlfzPKrnfubRDpsMFWa7aGt1/amheGfKShUkhtUzbdPKFkqOw70aBXzHhw6agCE P4yghuJIAFPLLsy219FVaGtFn5M+rZOHL8AfAYRg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, yang.yang29@zte.com.cn, Jaroslav Kysela , Takashi Iwai Subject: [PATCH 6.1 003/183] ALSA: control-led: use strscpy in set_led_id() Date: Mon, 16 Jan 2023 16:48:46 +0100 Message-Id: <20230116154803.486813422@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154803.321528435@linuxfoundation.org> References: <20230116154803.321528435@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jaroslav Kysela commit 70051cffb31b5ee09096351c3b41fcae6f89de31 upstream. The use of strncpy() in the set_led_id() was incorrect. The len variable should use 'min(sizeof(buf2) - 1, count)' expression. Use strscpy() function to simplify things and handle the error gracefully. Fixes: a135dfb5de15 ("ALSA: led control - add sysfs kcontrol LED marking layer") Reported-by: yang.yang29@zte.com.cn Link: https://lore.kernel.org/alsa-devel/202301091945513559977@zte.com.cn/ Cc: Signed-off-by: Jaroslav Kysela Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/core/control_led.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/sound/core/control_led.c +++ b/sound/core/control_led.c @@ -530,12 +530,11 @@ static ssize_t set_led_id(struct snd_ctl bool attach) { char buf2[256], *s, *os; - size_t len = max(sizeof(s) - 1, count); struct snd_ctl_elem_id id; int err; - strncpy(buf2, buf, len); - buf2[len] = '\0'; + if (strscpy(buf2, buf, sizeof(buf2)) < 0) + return -E2BIG; memset(&id, 0, sizeof(id)); id.iface = SNDRV_CTL_ELEM_IFACE_MIXER; s = buf2;