firewire: fix potential uaf in outbound_phy_packet_callback()

stable inclusion
from stable-v4.19.242
commit 34380b5647f13fecb458fea9a3eb3d8b3a454709
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7BYU9
CVE: CVE-2023-3159

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=34380b5647f1



--------------------------------

commit b7c81f80 upstream.

&e->event and e point to the same address, and &e->event could
be freed in queue_event. So there is a potential uaf issue if
we dereference e after calling queue_event(). Fix this by adding
a temporary variable to maintain e->client in advance, this can
avoid the potential uaf issue.

Cc: <stable@vger.kernel.org>
Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20220409041243.603210-2-o-takashi@sakamocchi.jp


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Wang Weiyang <wangweiyang2@huawei.com>
Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>