| From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 51/97] ALSA: usb-audio: Fix NULL dereference in create_fixed_stream_quirk() | Date | Mon, 4 Apr 2016 16:26:15 -0700 |
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3.13.11-ckt38 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Takashi Iwai <tiwai@suse.de>
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: Kamal Mostafa <kamal@canonical.com> --- sound/usb/quirks.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 44a04f3..e89156d 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) -- 2.7.4
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