averello/linux-stable-mirror
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2026-09-22 09:34:56 +02:00
Code Issues Packages Projects Releases Wiki Activity

ALSA: dummy: Check card index validity at probe

Browse Source 
commit 02442d5fe8 upstream.

snd_dummy_probe() blindly trusts that the given devptr->id value is
within the proper card index range.  It's OK for the devices the
driver itself creates at the module probe time, but if the device is
bound manually via sysfs interface, this could be -1 as "none", and
this leads to OOB access for index[] and other parameters.

Add a sanity check for the card index and warn/correct it if it's a
value out of the range.

Reported-by: syzbot+2fb5d1f7cc4c1f132bcc@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/6a73bd4d.01d0871a.3a0d52.0005.GAE@google.com
Cc: <stable@vger.kernel.org>
Link: https://patch.msgid.link/20260806100433.1287393-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2026-08-27 14:29:45 +02:00
committed by Greg Kroah-Hartman
parent b7528b4281
commit b20eb7ecbd
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sound/drivers/dummy.c
+6
View File
@@ -1025,6 +1025,12 @@ static int snd_dummy_probe(struct platform_device *devptr)
int idx, err;
int dev = devptr->id;
if (dev < 0 || dev >= SNDRV_CARDS) {
dev_warn(&devptr->dev,
"Invalid card index %d, using default 0\n", dev);
dev = 0;
}
err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
sizeof(struct snd_dummy), &card);
if (err < 0)