3.8.13.10 -stable review patch.  If anyone has any objections, please let me 
know.

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

From: Kees Cook <[email protected]>

commit be67b68d52fa28b9b721c47bb42068f0c1214855 upstream.

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

Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
---
 drivers/hid/hid-core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 194597f..869ead1 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1157,7 +1157,12 @@ 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);
 
-- 
1.8.1.2

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