linux-kernel - [PATCH] sound/pci/asihpi: check adapter index in hpi

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Message-ID: <1300401144.1796.4.camel@dan>
Date:	Thu, 17 Mar 2011 18:32:24 -0400
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>
Cc:	security@...nel.org, stable@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] sound/pci/asihpi: check adapter index in hpi_ioctl

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@...curity.com>
---
 sound/pci/asihpi/hpioctl.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/sound/pci/asihpi/hpioctl.c b/sound/pci/asihpi/hpioctl.c
index 22dbd91..448dd01 100644
--- a/sound/pci/asihpi/hpioctl.c
+++ b/sound/pci/asihpi/hpioctl.c
@@ -155,6 +155,11 @@ long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		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) {


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