This is a note to let you know that I've just added the patch titled
HID: core: fix validation of report id 0
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hid-core-fix-validation-of-report-id-0.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1b15d2e5b8077670b1e6a33250a0d9577efff4a5 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Thu, 17 Apr 2014 13:22:09 -0700
Subject: HID: core: fix validation of report id 0
From: Kees Cook <keescook@xxxxxxxxxxxx>
commit 1b15d2e5b8077670b1e6a33250a0d9577efff4a5 upstream.
Some drivers use the first HID report in the list instead of using an
index. In these cases, validation uses ID 0, which was supposed to mean
"first known report". This fixes the problem, which was causing at least
the lgff family of devices to stop working since hid_validate_values
was being called with ID 0, but the devices used single numbered IDs
for their reports:
0x05, 0x01, /* Usage Page (Desktop), */
0x09, 0x05, /* Usage (Gamepad), */
0xA1, 0x01, /* Collection (Application), */
0xA1, 0x02, /* Collection (Logical), */
0x85, 0x01, /* Report ID (1), */
...
Reported-by: Simon Wood <simon@xxxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hid/hid-core.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -842,7 +842,17 @@ struct hid_report *hid_validate_values(s
* ->numbered being checked, which may not always be the case when
* drivers go to access report values.
*/
- report = hid->report_enum[type].report_id_hash[id];
+ if (id == 0) {
+ /*
+ * Validating on id 0 means we should examine the first
+ * report in the list.
+ */
+ report = list_entry(
+ hid->report_enum[type].report_list.next,
+ struct hid_report, list);
+ } else {
+ report = hid->report_enum[type].report_id_hash[id];
+ }
if (!report) {
hid_err(hid, "missing %s %u\n", hid_report_names[type], id);
return NULL;
Patches currently in stable-queue which might be from keescook@xxxxxxxxxxxx are
queue-3.15/hid-core-fix-validation-of-report-id-0.patch
queue-3.15/ptrace-fix-fork-event-messages-across-pid-namespaces.patch
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