From 4a122c10fbfe9020df469f0f669da129c5757671 Mon Sep 17 00:00:00 2001
From: Dan Rosenberg <drosenberg@vsecurity.com>
Date: Thu, 17 Mar 2011 18:32:24 -0400
Subject: [PATCH] ALSA: sound/pci/asihpi: check adapter index in hpi_ioctl
Git-commit: 4a122c10fbfe9020df469f0f669da129c5757671
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git
Patch-mainline: 2.6.39-rc1
References: bnc#680816

The user-supplied index into the adapters array needs to be checked, or
an out-of-bounds kernel pointer could be accessed and used, leading to
potentially exploitable memory corruption.

Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/pci/asihpi/hpioctl.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/pci/asihpi/hpioctl.c
+++ b/sound/pci/asihpi/hpioctl.c
@@ -155,6 +155,11 @@
 		goto out;
 	}
 
+	if (hm->h.adapter_index >= HPI_MAX_ADAPTERS) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	pa = &adapters[hm->h.adapter_index];
 	hr->h.size = 0;
 	if (hm->h.object == HPI_OBJ_SUBSYSTEM) {