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Wei Yongjun
b3d72d3135
Kernel fault injection test reports null-ptr-deref as follows:
BUG: kernel NULL pointer dereference, address: 0000000000000008
RIP: 0010:cfg802154_netdev_notifier_call+0x120/0x310 include/linux/list.h:114
Call Trace:
<TASK>
raw_notifier_call_chain+0x6d/0xa0 kernel/notifier.c:87
call_netdevice_notifiers_info+0x6e/0xc0 net/core/dev.c:1944
unregister_netdevice_many_notify+0x60d/0xcb0 net/core/dev.c:1982
unregister_netdevice_queue+0x154/0x1a0 net/core/dev.c:10879
register_netdevice+0x9a8/0xb90 net/core/dev.c:10083
ieee802154_if_add+0x6ed/0x7e0 net/mac802154/iface.c:659
ieee802154_register_hw+0x29c/0x330 net/mac802154/main.c:229
mcr20a_probe+0xaaa/0xcb1 drivers/net/ieee802154/mcr20a.c:1316
ieee802154_if_add() allocates wpan_dev as netdev's private data, but not
init the list in struct wpan_dev. cfg802154_netdev_notifier_call() manage
the list when device register/unregister, and may lead to null-ptr-deref.
Use INIT_LIST_HEAD() on it to initialize it correctly.
Fixes: fcf39e6e88 ("ieee802154: add wpan_dev_list")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20221130091705.1831140-1-weiyongjun@huaweicloud.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.