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ALSA: emu10k1: Fix card shortname string buffer overflow 

Some models provide too long string for the shortname that has 32bytes
including the terminator, and it results in a non-terminated string
exposed to the user-space.  This isn't too critical, though, as the
string is stopped at the succeeding longname string.

This patch fixes such entries by dropping "SB" prefix (it's enough to
fit within 32 bytes, so far).  Meanwhile, it also changes strcpy()
with strlcpy() to make sure that this kind of problem won't happen in
future, too.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-04-27 13:00:09 +02:00
parent 7290006d8c
commit d02260824e
2 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sound/pci/emu10k1/emu10k1.c
View File

@ -183,8 +183,10 @@ static int snd_card_emu10k1_probe(struct pci_dev *pci,
}
#endif
strcpy(card->driver, emu->card_capabilities->driver);
strcpy(card->shortname, emu->card_capabilities->name);
strlcpy(card->driver, emu->card_capabilities->driver,
sizeof(card->driver));
strlcpy(card->shortname, emu->card_capabilities->name,
sizeof(card->shortname));
snprintf(card->longname, sizeof(card->longname),
"%s (rev.%d, serial:0x%x) at 0x%lx, irq %i",
card->shortname, emu->revision, emu->serial, emu->port, emu->irq);

4
sound/pci/emu10k1/emu10k1_main.c
View File

@ -1446,7 +1446,7 @@ static struct snd_emu_chip_details emu_chip_details[] = {
*
*/
{.vendor = 0x1102, .device = 0x0008, .subsystem = 0x20011102,
.driver = "Audigy2", .name = "SB Audigy 2 ZS Notebook [SB0530]",
.driver = "Audigy2", .name = "Audigy 2 ZS Notebook [SB0530]",
.id = "Audigy2",
.emu10k2_chip = 1,
.ca0108_chip = 1,
@ -1596,7 +1596,7 @@ static struct snd_emu_chip_details emu_chip_details[] = {
.adc_1361t = 1, /* 24 bit capture instead of 16bit */
.ac97_chip = 1} ,
{.vendor = 0x1102, .device = 0x0004, .subsystem = 0x10051102,
.driver = "Audigy2", .name = "SB Audigy 2 Platinum EX [SB0280]",
.driver = "Audigy2", .name = "Audigy 2 Platinum EX [SB0280]",
.id = "Audigy2",
.emu10k2_chip = 1,
.ca0102_chip = 1,