From 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b Mon Sep 17 00:00:00 2001 From: Adrian Salido Date: Fri, 8 Sep 2017 10:55:27 -0700 Subject: [PATCH] HID: i2c-hid: allocate hid buffers for real worst case 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. Cc: stable@vger.kernel.org Signed-off-by: Adrian Salido Reviewed-by: Benson Leung Signed-off-by: Guenter Roeck Signed-off-by: Dmitry Torokhov Signed-off-by: Jiri Kosina --- drivers/hid/i2c-hid/i2c-hid.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index 7739614..9145c21 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -543,7 +543,8 @@ static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size) { /* 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 */ -- 2.7.4