diff options
| author | Adrian Salido <salidoa@google.com> | 2017-09-08 10:55:27 -0700 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-09-13 18:16:40 +0200 |
| commit | 8320caeeffdefec3b58b9d4a7ed8e1079492fe7b (patch) | |
| tree | db912024c509ba7ecad44eae01393f9c99c2d4d8 /drivers/hid/i2c-hid/i2c-hid.c | |
| parent | cac72b990d34f4c70208998a86f910ba38253c94 (diff) | |
| download | linux-8320caeeffdefec3b58b9d4a7ed8e1079492fe7b.tar.bz2 | |
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 <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>
Diffstat (limited to 'drivers/hid/i2c-hid/i2c-hid.c')
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index 77396145d2d0..9145c2129a96 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 */ |