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authorTakashi Iwai <tiwai@suse.de>2016-03-15 12:09:10 +0100
committerSasha Levin <sasha.levin@oracle.com>2016-04-18 08:50:59 -0400
commit6ed72ce6ab8b38803b12df8c62a3a52becf19017 (patch)
tree16dc718abb3f1fd5b8a9886711c9987ef7e54de0 /sound
parent4084f3ab4ddb216046de8e3d8652398e9477c03e (diff)
ALSA: usb-audio: Fix NULL dereference in create_fixed_stream_quirk()
[ Upstream commit 0f886ca12765d20124bd06291c82951fd49a33be ] 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> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'sound')
-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 a4d03e5da3e0..47751f08c7a3 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -177,6 +177,12 @@ 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)