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[ Upstream commit 9bdaf3b91efd229dd272b228e13df10310c80d19 ] There's a race condition in the netdev registration in that NETDEV_REGISTER actually happens after the netdev is available, and so if we initialize things only there, we might get called with an uninitialized wdev through nl80211 - not using a wdev but using a netdev interface index. I found this while looking into a syzbot report, but it doesn't really seem to be related, and unfortunately there's no repro for it (yet). I can't (yet) explain how it managed to get into cfg80211_release_pmsr() from nl80211_netlink_notify() without the wdev having been initialized, as the latter only iterates the wdevs that are linked into the rdev, which even without the change here happened after init. However, looking at this, it seems fairly clear that the init needs to be done earlier, otherwise we might even re-init on a netns move, when data might still be pending. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Link: https://lore.kernel.org/r/20201009135821.fdcbba3aad65.Ie9201d91dbcb7da32318812effdc1561aeaf4cdc@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.