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authorXi Wang <xi.wang@gmail.com>2012-02-14 14:18:48 +0400
committerTakashi Iwai <tiwai@suse.de>2012-02-15 17:58:15 +0400
commit8866f405efd4171f9d9c91901d2dd02f01bacb60 (patch)
tree414b07ed6d979f9aad804dc16b4f280247741eaf /sound/usb/card.h
parent27c3afe6e1cf129faac90405121203962da08ff4 (diff)
downloadlinux-8866f405efd4171f9d9c91901d2dd02f01bacb60.tar.xz
ALSA: usb-audio: avoid integer overflow in create_fixed_stream_quirk()
A malicious USB device could feed in a large nr_rates value. This would cause the subsequent call to kmemdup() to allocate a smaller buffer than expected, leading to out-of-bounds access. This patch validates the nr_rates value and reuses the limit introduced in commit 4fa0e81b ("ALSA: usb-audio: fix possible hang and overflow in parse_uac2_sample_rate_range()"). Signed-off-by: Xi Wang <xi.wang@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.h')
-rw-r--r--sound/usb/card.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h
index a39edcc32a93..da5fa1ac4eda 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -1,6 +1,7 @@
#ifndef __USBAUDIO_CARD_H
#define __USBAUDIO_CARD_H
+#define MAX_NR_RATES 1024
#define MAX_PACKS 20
#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
#define MAX_URBS 8