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

Message ID 20210222151231.22572-16-romain.perier@gmail.com (mailing list archive)
State New, archived
Headers show
Series Manual replacement of all strlcpy in favor of strscpy | expand

Commit Message

Romain Perier Feb. 22, 2021, 3:12 p.m. UTC
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@gmail.com>
---
 sound/usb/card.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

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);