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| author | Loic Poulain <loic.poulain@intel.com> | 2014-08-08 19:07:16 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2014-08-14 08:49:19 +0200 |
| commit | 4807b51895dce8aa650ebebc51fa4a795ed6b8b8 (patch) | |
| tree | 8030a32684c78cb7b03939e640ef58c522bd49a7 /drivers/bluetooth | |
| parent | 5d88cc73dded31a93fcc4821f33a8c3d755bf454 (diff) | |
| download | linux-4807b51895dce8aa650ebebc51fa4a795ed6b8b8.tar.gz linux-4807b51895dce8aa650ebebc51fa4a795ed6b8b8.tar.bz2 linux-4807b51895dce8aa650ebebc51fa4a795ed6b8b8.zip | |
Bluetooth: Fix HCI H5 corrupted ack value
In this expression: seq = (seq - 1) % 8
seq (u8) is implicitly converted to an int in the arithmetic operation.
So if seq value is 0, operation is ((0 - 1) % 8) => (-1 % 8) => -1.
The new seq value is 0xff which is an invalid ACK value, we expect 0x07.
It leads to frequent dropped ACK and retransmission.
Fix this by using '&' binary operator instead of '%'.
Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/hci_h5.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c index caacb422995d..a22838669b4e 100644 --- a/drivers/bluetooth/hci_h5.c +++ b/drivers/bluetooth/hci_h5.c @@ -237,7 +237,7 @@ static void h5_pkt_cull(struct h5 *h5) break; to_remove--; - seq = (seq - 1) % 8; + seq = (seq - 1) & 0x07; } if (seq != h5->rx_ack) |