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John Fastabend 5731a879d0 bpf: sockmap missing NULL psock check
Add psock NULL check to handle a racing sock event that can get the
sk_callback_lock before this case but after xchg happens causing the
refcnt to hit zero and sock user data (psock) to be null and queued
for garbage collection.

Also add a comment in the code because this is a bit subtle and
not obvious in my opinion.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-01-07 00:01:46 +01:00
arch Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-23 11:53:04 -08:00
block block-throttle: avoid double charge 2017-12-20 11:10:17 -07:00
certs
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-12-22 12:22:48 -08:00
Documentation sound fixes for 4.15-rc6 2017-12-27 12:59:27 -08:00
drivers sh_eth: fix SH7757 GEther initialization 2018-01-05 13:59:18 -05:00
firmware
fs Changes since last update: 2017-12-22 12:27:27 -08:00
include sh_eth: fix SH7757 GEther initialization 2018-01-05 13:59:18 -05:00
init Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-23 11:53:04 -08:00
ipc
kernel bpf: sockmap missing NULL psock check 2018-01-07 00:01:46 +01:00
lib
mm Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-12-21 11:13:37 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2018-01-05 10:33:01 -05:00
samples
scripts
security
sound ALSA: hda - Fix missing COEF init for ALC225/295/299 2017-12-27 08:53:59 +01:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-28 23:20:21 -08:00
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MAINTAINERS MAINTAINERS: Update my email address. 2018-01-04 13:38:29 -05:00
Makefile Linux 4.15-rc5 2017-12-23 20:47:16 -08:00
README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.