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HID: i2c-hid: allocate hid buffers for real worst case

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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 <salidoa@google.com>
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Adrian Salido 2017-09-08 10:55:27 -07:00 committed by Jiri Kosina
parent cac72b990d
commit 8320caeeff
1 changed files with 2 additions and 1 deletions
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3
drivers/hid/i2c-hid/i2c-hid.c
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@ -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 */