This is a note to let you know that I've just added the patch titled
Bluetooth: L2CAP: Fix rejecting L2CAP_CONN_PARAM_UPDATE_REQ
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-l2cap-fix-rejecting-l2cap_conn_param_updat.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 16bb27c3bcaf1613fe3e5d5487f528284e764d63
Author: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Date: Mon May 20 16:03:07 2024 -0400
Bluetooth: L2CAP: Fix rejecting L2CAP_CONN_PARAM_UPDATE_REQ
[ Upstream commit 806a5198c05987b748b50f3d0c0cfb3d417381a4 ]
This removes the bogus check for max > hcon->le_conn_max_interval since
the later is just the initial maximum conn interval not the maximum the
stack could support which is really 3200=4000ms.
In order to pass GAP/CONN/CPUP/BV-05-C one shall probably enter values
of the following fields in IXIT that would cause hci_check_conn_params
to fail:
TSPX_conn_update_int_min
TSPX_conn_update_int_max
TSPX_conn_update_peripheral_latency
TSPX_conn_update_supervision_timeout
Link: https://github.com/bluez/bluez/issues/847
Fixes: e4b019515f95 ("Bluetooth: Enforce validation on max value of connection interval")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 878e7e92d8efd..7aa8e8e615812 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1430,18 +1430,46 @@ static inline int hci_check_conn_params(u16 min, u16 max, u16 latency,
{
u16 max_latency;
- if (min > max || min < 6 || max > 3200)
+ if (min > max) {
+ BT_WARN("min %d > max %d", min, max);
return -EINVAL;
+ }
+
+ if (min < 6) {
+ BT_WARN("min %d < 6", min);
+ return -EINVAL;
+ }
+
+ if (max > 3200) {
+ BT_WARN("max %d > 3200", max);
+ return -EINVAL;
+ }
+
+ if (to_multiplier < 10) {
+ BT_WARN("to_multiplier %d < 10", to_multiplier);
+ return -EINVAL;
+ }
- if (to_multiplier < 10 || to_multiplier > 3200)
+ if (to_multiplier > 3200) {
+ BT_WARN("to_multiplier %d > 3200", to_multiplier);
return -EINVAL;
+ }
- if (max >= to_multiplier * 8)
+ if (max >= to_multiplier * 8) {
+ BT_WARN("max %d >= to_multiplier %d * 8", max, to_multiplier);
return -EINVAL;
+ }
max_latency = (to_multiplier * 4 / max) - 1;
- if (latency > 499 || latency > max_latency)
+ if (latency > 499) {
+ BT_WARN("latency %d > 499", latency);
return -EINVAL;
+ }
+
+ if (latency > max_latency) {
+ BT_WARN("latency %d > max_latency %d", latency, max_latency);
+ return -EINVAL;
+ }
return 0;
}
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 3c6e72c4fdde3..3f9b2b4a62ffd 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -5316,13 +5316,7 @@ static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
memset(&rsp, 0, sizeof(rsp));
- if (max > hcon->le_conn_max_interval) {
- BT_DBG("requested connection interval exceeds current bounds.");
- err = -EINVAL;
- } else {
- err = hci_check_conn_params(min, max, latency, to_multiplier);
- }
-
+ err = hci_check_conn_params(min, max, latency, to_multiplier);
if (err)
rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
else
