Bluetooth: prefetch channel before killing sock

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Prefetch channel before killing sock in order to fix UAF like

 BUG: KASAN: use-after-free in l2cap_sock_release+0x24c/0x290 net/bluetooth/l2cap_sock.c:1212
 Read of size 8 at addr ffff8880944904a0 by task syz-fuzzer/9751

Reported-by: syzbot+c3c5bdea7863886115dc@syzkaller.appspotmail.com
Fixes: 6c08fc896b ("Bluetooth: Fix refcount use-after-free issue")
Cc: Manish Mandlik <mmandlik@google.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

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Hillf Danton 2020-02-05 10:31:59 +08:00 • committed by Marcel Holtmann

parent 89bd614796

commit 2a154903ce

1 changed files with 6 additions and 4 deletions

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net/bluetooth/l2cap_sock.c

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