This is a note to let you know that I've just added the patch titled HID: i2c-hid: allocate hid buffers for real worst case to the 4.9-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-i2c-hid-allocate-hid-buffers-for-real-worst-case.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b Mon Sep 17 00:00:00 2001 From: Adrian Salido <salidoa@xxxxxxxxxx> Date: Fri, 8 Sep 2017 10:55:27 -0700 Subject: HID: i2c-hid: allocate hid buffers for real worst case From: Adrian Salido <salidoa@xxxxxxxxxx> commit 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b upstream. The buffer allocation is not currently accounting for an extra byte for the report id. This can cause an out of bounds access in function i2c_hid_set_or_send_report() with reportID > 15. Signed-off-by: Adrian Salido <salidoa@xxxxxxxxxx> Reviewed-by: Benson Leung <bleung@xxxxxxxxxxxx> Signed-off-by: Guenter Roeck <groeck@xxxxxxxxxxxx> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Signed-off-by: Jiri Kosina <jkosina@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/hid/i2c-hid/i2c-hid.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -604,7 +604,8 @@ static int i2c_hid_alloc_buffers(struct { /* the worst case is computed from the set_report command with a * reportID > 15 and the maximum report length */ - int args_len = sizeof(__u8) + /* optional ReportID byte */ + int args_len = sizeof(__u8) + /* ReportID */ + sizeof(__u8) + /* optional ReportID byte */ sizeof(__u16) + /* data register */ sizeof(__u16) + /* size of the report */ report_size; /* report */ Patches currently in stable-queue which might be from salidoa@xxxxxxxxxx are queue-4.9/hid-i2c-hid-allocate-hid-buffers-for-real-worst-case.patch