[PATCH 3.18 27/54] ALSA: trident: Suppress gcc string warning

From: Greg Kroah-Hartman
Date: Tue Dec 11 2018 - 10:43:23 EST

3.18-stable review patch. If anyone has any objections, please let me know.


From: Takashi Iwai <tiwai@xxxxxxx>

commit d6b340d7cb33c816ef4abe8143764ec5ab14a5cc upstream.

The meddlesome gcc warns about the possible shortname string in
trident driver code:
sound/pci/trident/trident.c: In function âsnd_trident_probeâ:
sound/pci/trident/trident.c:126:2: warning: âstrcatâ accessing 17 or more bytes at offsets 36 and 20 may overlap 1 byte at offset 36 [-Wrestrict]
strcat(card->shortname, card->driver);

It happens since gcc calculates the possible string size from
card->driver, but this can't be true since we did set the string just
before that, and they are much shorter.

For shutting it up, use the exactly same string set to card->driver
for strcat() to card->shortname, too.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

sound/pci/trident/trident.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/pci/trident/trident.c
+++ b/sound/pci/trident/trident.c
@@ -123,7 +123,7 @@ static int snd_trident_probe(struct pci_
} else {
strcpy(card->shortname, "Trident ");
- strcat(card->shortname, card->driver);
+ strcat(card->shortname, str);
sprintf(card->longname, "%s PCI Audio at 0x%lx, irq %d",
card->shortname, trident->port, trident->irq);