usb: gadget: u_audio: fix pcm/card naming in g_audio_setup()

[ Upstream commit dfa042fa310caa475667b8c38d852f14439e0b01 ]

Fix below smatch (v0.5.0-4443-g69e9094e11c1) warnings:
drivers/usb/gadget/function/u_audio.c:607 g_audio_setup() warn: strcpy() 'pcm_name' of unknown size might be too large for 'pcm->name'
drivers/usb/gadget/function/u_audio.c:614 g_audio_setup() warn: strcpy() 'card_name' of unknown size might be too large for 'card->driver'
drivers/usb/gadget/function/u_audio.c:615 g_audio_setup() warn: strcpy() 'card_name' of unknown size might be too large for 'card->shortname'

Below commits performed a similar 's/strcpy/strlcpy/' rework:
* v2.6.31 commit 8372d4980fbc ("ALSA: ctxfi - Fix PCM device naming")
* v4.14 commit 003d3e70dbeb ("ALSA: ad1848: fix format string overflow warning")
* v4.14 commit 6d8b04de87e1 ("ALSA: cs423x: fix format string overflow warning")

Fixes: eb9fecb9e69b ("usb: gadget: f_uac2: split out audio core")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c
index 3971bbab88bd7ccf0282cd4a2ade6d636cfa1c8b..429d7928b7c9556d78cc529bfe9b4e33809c1f86 100644 (file)
--- a/drivers/usb/gadget/function/u_audio.c
+++ b/drivers/usb/gadget/function/u_audio.c
@@ -604,15 +604,15 @@ int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
        if (err < 0)
                goto snd_fail;
 
-       strcpy(pcm->name, pcm_name);
+       strlcpy(pcm->name, pcm_name, sizeof(pcm->name));
        pcm->private_data = uac;
        uac->pcm = pcm;
 
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
 
-       strcpy(card->driver, card_name);
-       strcpy(card->shortname, card_name);
+       strlcpy(card->driver, card_name, sizeof(card->driver));
+       strlcpy(card->shortname, card_name, sizeof(card->shortname));
        sprintf(card->longname, "%s %i", card_name, card->dev->id);
 
        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,