Bluetooth: L2CAP: Fix potential user-after-free

Bluetooth: L2CAP: Fix potential user-after-free

[ Upstream commit 9a9bb84450f09d680a836ad0d702546022369dc2 ]

This fixes all instances of which requires to allocate a buffer calling
alloc_skb which may release the chan lock and reacquire later which
makes it possible that the chan is disconnected in the meantime.

Fixes: b423603811b8 ("Bluetooth: Lock the L2CAP channel when sending")
Reported-by: Alexander Coffin <alex.coffin@matician.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>