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Fri, 06 Nov 2026 08:56:23 -0800 (PST) Received: from localhost.localdomain ([103.177.253.113]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b25e4df114sm7329756c88.18.2026.11.06.08.56.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 08:56:23 -0800 (PST) From: Sreeraj S Kurup To: perex@perex.cz, tiwai@suse.com, tiwai@suse.de Cc: linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, Sreeraj S Kurup Subject: [PATCH] ALSA: control: Trim whitespace from sysfs input Date: Fri, 6 Nov 2026 16:55:31 +0000 Message-ID: <20261106165531.4074-1-sreekuttan2156239@gmail.com> X-Mailer: git-send-email 2.55.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The attach and detach sysfs interfaces receive input from userspace. When userspace writes a value using echo, the input normally ends with a newline character. The parser does not remove this newline in all input formats. For example, a bare numeric ID can be treated as a control name, and an unquoted name= field can include the newline. Trim leading and trailing whitespace before parsing the input. This keeps spaces inside mixer control names unchanged. Signed-off-by: Sreeraj S Kurup --- sound/core/control_led.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/core/control_led.c b/sound/core/control_led.c index 501387287ae6..a640e7835ce2 100644 --- a/sound/core/control_led.c +++ b/sound/core/control_led.c @@ -518,6 +518,11 @@ static ssize_t set_led_id(struct snd_ctl_led_card *led_card, const char *buf, si if (strscpy(buf2, buf, sizeof(buf2)) < 0) return -E2BIG; + + s = strim(buf2); + if (s != buf2) + memmove(buf2, s, strlen(s) + 1); + memset(&id, 0, sizeof(id)); id.iface = SNDRV_CTL_ELEM_IFACE_MIXER; s = buf2; -- 2.55.0