public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-04-13 09:59:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Bluetooth: L2CAP: accept zero as a special value for MTU auto-selection

Browse source 
One of the possible ways to enable the input MTU auto-selection for L2CAP
connections is supposed to be through passing a special "0" value for it
as a socket option. Commit [1] added one of those into avdtp. However, it
simply wouldn't work because the kernel still treats the specified value
as invalid and denies the setting attempt. Recorded BlueZ logs include the
following:

  bluetoothd[496]: profiles/audio/avdtp.c:l2cap_connect() setsockopt(L2CAP_OPTIONS): Invalid argument (22)

[1]: ae5be371a9

Found by Linux Verification Center (linuxtesting.org).

Fixes: 4b6e228e29 ("Bluetooth: Auto tune if input MTU is set to 0")
Cc: stable@vger.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Fedor Pchelkin 2025-01-29 00:08:14 +03:00 • committed by Luiz Augusto von Dentz
parent 7de119bb79
commit 5c61419e02
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
net/bluetooth/l2cap_sock.c
View file

@ -710,12 +710,12 @@ static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
{
switch (chan->scid) {
case L2CAP_CID_ATT:
if (mtu < L2CAP_LE_MIN_MTU)
if (mtu && mtu < L2CAP_LE_MIN_MTU)
return false;
break;
default:
if (mtu < L2CAP_DEFAULT_MIN_MTU)
if (mtu && mtu < L2CAP_DEFAULT_MIN_MTU)
return false;
}