linux-kernel - [PATCH 3.2 056/149] HID: picolcd_core: validate output report details

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Message-ID: <lsq.1382345188.793239747@decadent.org.uk>
Date:	Mon, 21 Oct 2013 09:46:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Jiri Kosina" <jkosina@...e.cz>,
	"Bruno Prémont" <bonbons@...ux-vserver.org>,
	"Kees Cook" <keescook@...omium.org>
Subject: [PATCH 3.2 056/149] HID: picolcd_core: validate output report details

3.2.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit 1e87a2456b0227ca4ab881e19a11bb99d164e792 upstream.

A HID device could send a malicious output report that would cause the
picolcd HID driver to trigger a NULL dereference during attr file writing.

[jkosina@...e.cz: changed

	report->maxfield < 1

to

	report->maxfield != 1

as suggested by Bruno].

CVE-2013-2899

Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Bruno Prémont <bonbons@...ux-vserver.org>
Acked-by: Bruno Prémont <bonbons@...ux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hid/hid-picolcd_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -1424,7 +1424,7 @@ static ssize_t picolcd_operation_mode_st
 		buf += 10;
 		cnt -= 10;
 	}
-	if (!report)
+	if (!report || report->maxfield != 1)
 		return -EINVAL;
 
 	while (cnt > 0 && (buf[cnt-1] == '\n' || buf[cnt-1] == '\r'))

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