linux-kernel - [PATCH 15/20] ALSA: usb-audio: Manual replacement of the deprecated strlcpy() with return values

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Message-Id: <20210222151231.22572-16-romain.perier@gmail.com>
Date:   Mon, 22 Feb 2021 16:12:26 +0100
From:   Romain Perier <romain.perier@...il.com>
To:     Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     Romain Perier <romain.perier@...il.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 15/20] ALSA: usb-audio: Manual replacement of the deprecated strlcpy() with return values

The strlcpy() reads the entire source buffer first, it is dangerous if
the source buffer lenght is unbounded or possibility non NULL-terminated.
It can lead to linear read overflows, crashes, etc...

As recommended in the deprecated interfaces [1], it should be replaced
by strscpy.

This commit replaces all calls to strlcpy that handle the return values
by the corresponding strscpy calls with new handling of the return
values (as it is quite different between the two functions).

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy

Signed-off-by: Romain Perier <romain.perier@...il.com>
---
 sound/usb/card.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 85ed8507e41a..acb1ea3e16a3 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -496,7 +496,7 @@ static void usb_audio_make_longname(struct usb_device *dev,
 	struct snd_card *card = chip->card;
 	const struct usb_audio_device_name *preset;
 	const char *s = NULL;
-	int len;
+	ssize_t len;
 
 	preset = lookup_device_name(chip->usb_id);
 
-- 
2.20.1