diff options
| author | George Spelvin <linux@horizon.com> | 2014-05-11 08:12:09 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-07-25 23:44:23 -0300 |
| commit | 20d7e3ca1be76a13fb4ea22246bb9d0c4c365809 (patch) | |
| tree | 55145fffdb69774a882a38e0a4b1086271107716 /drivers/media/rc | |
| parent | 7cec72ce00c174fd74d1183599d3d3dcc5dedc26 (diff) | |
| download | linux-20d7e3ca1be76a13fb4ea22246bb9d0c4c365809.tar.bz2 | |
[media] ati_remote: Check the checksum
An input report is 4 bytes long, but there are only 12 bits
of actual payload. The 4 bytes are:
data[0] = 0x14
data[1] = data[2] + data[3] + 0xd5 (a checksum byte)
data[2] = the raw scancode (plus toggle bit in msbit)
data[3] = channel << 4 (the low 4 bits must be zero)
Ignore reports with a bad checksum.
Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/rc')
| -rw-r--r-- | drivers/media/rc/ati_remote.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/media/rc/ati_remote.c b/drivers/media/rc/ati_remote.c index 2e1335306eb3..52a5af610259 100644 --- a/drivers/media/rc/ati_remote.c +++ b/drivers/media/rc/ati_remote.c @@ -507,8 +507,9 @@ static void ati_remote_input_report(struct urb *urb) */ /* Deal with strange looking inputs */ - if ( (urb->actual_length != 4) || (data[0] != 0x14) || - ((data[3] & 0x0f) != 0x00) ) { + if ( urb->actual_length != 4 || data[0] != 0x14 || + data[1] != (unsigned char)(data[2] + data[3] + 0xD5) || + (data[3] & 0x0f) != 0x00) { ati_remote_dump(&urb->dev->dev, data, urb->actual_length); return; } @@ -524,9 +525,9 @@ static void ati_remote_input_report(struct urb *urb) remote_num = (data[3] >> 4) & 0x0f; if (channel_mask & (1 << (remote_num + 1))) { dbginfo(&ati_remote->interface->dev, - "Masked input from channel 0x%02x: data %02x,%02x, " + "Masked input from channel 0x%02x: data %02x, " "mask= 0x%02lx\n", - remote_num, data[1], data[2], channel_mask); + remote_num, data[2], channel_mask); return; } |