From: Kees Cook <keescook@chromium.org>
Date: Wed, 28 Aug 2013 20:32:01 +0000 (+0200)
Subject: HID: check for NULL field when setting values
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8bb7aacefb408f829835f3692dd34fab9801d86d;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

HID: check for NULL field when setting values

commit be67b68d52fa28b9b721c47bb42068f0c1214855 upstream.

Defensively check that the field to be worked on is not NULL.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index eb202481fb09..ed626e01514b 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1156,7 +1156,12 @@ EXPORT_SYMBOL_GPL(hid_output_report);
 
 int hid_set_field(struct hid_field *field, unsigned offset, __s32 value)
 {
-	unsigned size = field->report_size;
+	unsigned size;
+
+	if (!field)
+		return -1;
+
+	size = field->report_size;
 
 	hid_dump_input(field->report->device, field->usage + offset, value);