diff options
| author | Takashi Iwai <tiwai@suse.de> | 2016-03-15 12:09:10 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-04-11 16:44:09 +0200 |
| commit | 3b8dbf6b7b4e4fd1274fe2e5b04eda5a3394c543 (patch) | |
| tree | 9b5c450d2ea386fbeb04c449e644cfd1a6e8fd79 /sound | |
| parent | 4f5d9400a57200b8a9f6a683a7beadd159ac09e1 (diff) | |
ALSA: usb-audio: Fix NULL dereference in create_fixed_stream_quirk()
commit 0f886ca12765d20124bd06291c82951fd49a33be upstream.
create_fixed_stream_quirk() may cause a NULL-pointer dereference by
accessing the non-existing endpoint when a USB device with a malformed
USB descriptor is used.
This patch avoids it simply by adding a sanity check of bNumEndpoints
before the accesses.
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=971125
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/usb/quirks.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 81d7e6a9725e..88fd1c561a15 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -168,6 +168,12 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip, } alts = &iface->altsetting[fp->altset_idx]; altsd = get_iface_desc(alts); + if (altsd->bNumEndpoints < 1) { + kfree(fp); + kfree(rate_table); + return -EINVAL; + } + fp->protocol = altsd->bInterfaceProtocol; if (fp->datainterval == 0) |