In preparation for removing the deprecated strlcat() API[1], replace the
strlcat() call in append_ctl_name() with strlen() and snprintf(),
preserving its return value semantics (the total length of the string it
attempted to create).

Also replace an open-coded strlcat() call in build_connector_control()
with append_ctl_name().

Link: https://github.com/KSPP/linux/issues/370 [1]
Cc: [email protected]
Assisted-by: CoPilot:Claude-3-5-Sonnet [editor_update_file, shell_command_run]
Signed-off-by: Bill Wendling <[email protected]>
---
Cc: Russell King <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: WANG Xuerui <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: [email protected]
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ian Abbott <[email protected]>
Cc: H Hartley Sweeten <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Simona Vetter <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: "Thomas Hellström" <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Dmitry Torokhov <[email protected]>
Cc: Matthias Schwarzott <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Tony Nguyen <[email protected]>
Cc: Przemek Kitszel <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Eric Dumazet <[email protected]>
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Cc: Paolo Abeni <[email protected]>
Cc: Arend van Spriel <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
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Cc: Alim Akhtar <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Anil Gurumurthy <[email protected]>
Cc: Sudarsana Kalluru <[email protected]>
Cc: "Martin K. Petersen" <[email protected]>
Cc: Trond Myklebust <[email protected]>
Cc: Anna Schumaker <[email protected]>
Cc: Mike Marshall <[email protected]>
Cc: Martin Brandenburg <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Jiri Pirko <[email protected]>
Cc: Simon Horman <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: Jeff Layton <[email protected]>
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Cc: Dai Ngo <[email protected]>
Cc: Tom Talpey <[email protected]>
Cc: Jaroslav Kysela <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Bill Wendling <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: "Mike Rapoport (Microsoft)" <[email protected]>
Cc: Kanglong Wang <[email protected]>
Cc: Tiezhu Yang <[email protected]>
Cc: Qiang Ma <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Pengpeng Hou <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Breno Leitao <[email protected]>
Cc: Thorsten Blum <[email protected]>
Cc: Harshit Mogalapalli <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Ashutosh Desai <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Dmitry Baryshkov <[email protected]>
Cc: Johan Hovold <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Miri Korenblit <[email protected]>
Cc: Alexander Stein <[email protected]>
Cc: Cryolitia PukNgae <[email protected]>
Cc: Jiaming Zhang <[email protected]>
Cc: Will Porter <[email protected]>
Cc: Cen Zhang <[email protected]>
Cc: "Cássio Gabriel" <[email protected]>
Cc: Rong Zhang <[email protected]>
Cc: Arun Raghavan <[email protected]>
Cc: [email protected]
Cc: [email protected]
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Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
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Cc: [email protected]
Cc: [email protected]
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---
 sound/usb/mixer.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index ecaa8bc08d7c..f64ecad4e77e 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1722,7 +1722,11 @@ const struct snd_kcontrol_new *snd_usb_feature_unit_ctl 
= &usb_feature_unit_ctl;
  */
 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
 {
-       return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
+       size_t len = strlen(kctl->id.name);
+
+       if (len >= sizeof(kctl->id.name))
+               return len + strlen(str);
+       return len + snprintf(kctl->id.name + len, sizeof(kctl->id.name) - len, 
"%s", str);
 }
 
 /*
@@ -2090,7 +2094,7 @@ static void build_connector_control(struct 
usb_mixer_interface *mixer,
        }
 
        if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name)))
-               strlcat(kctl->id.name, " Jack", sizeof(kctl->id.name));
+               append_ctl_name(kctl, " Jack");
        else
                get_connector_control_name(mixer, term, is_input, kctl->id.name,
                                           sizeof(kctl->id.name));
-- 
2.55.0.1032.g73a4cd73de-goog

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