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authorTakashi Iwai <tiwai@suse.de>2016-03-15 14:09:10 +0300
committerTakashi Iwai <tiwai@suse.de>2016-03-16 14:42:16 +0300
commit0f886ca12765d20124bd06291c82951fd49a33be (patch)
tree77a2f29035f4d41e9cd614645baf1534c291cac0
parentb62232d429fa8b1dcf5d8503aa5a5397a03e646a (diff)
downloadlinux-0f886ca12765d20124bd06291c82951fd49a33be.tar.xz
ALSA: usb-audio: Fix NULL dereference in create_fixed_stream_quirk()
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 Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/quirks.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 5b03296a5bd9..529c35cceaa6 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -180,6 +180,12 @@ 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)