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Ignacy Gawędzki ebb966d3bd netfilter: fix regression in looped (broad|multi)cast's MAC handling 
In commit 5648b5e116 ("netfilter: nfnetlink_queue: fix OOB when mac
header was cleared"), the test for non-empty MAC header introduced in
commit 2c38de4c1f ("netfilter: fix looped (broad|multi)cast's MAC
handling") has been replaced with a test for a set MAC header.

This breaks the case when the MAC header has been reset (using
skb_reset_mac_header), as is the case with looped-back multicast
packets.  As a result, the packets ending up in NFQUEUE get a bogus
hwaddr interpreted from the first bytes of the IP header.

This patch adds a test for a non-empty MAC header in addition to the
test for a set MAC header.  The same two tests are also implemented in
nfnetlink_log.c, where the initial code of commit 2c38de4c1f
("netfilter: fix looped (broad|multi)cast's MAC handling") has not been
touched, but where supposedly the same situation may happen.

Fixes: 5648b5e116 ("netfilter: nfnetlink_queue: fix OOB when mac header was cleared")
Signed-off-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-12-16 00:06:24 +01:00
arch Networking fixes for 5.16-rc5, including fixes from bpf, can and netfilter. 2021-12-09 11:26:44 -08:00
block Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-08 16:06:44 -08:00
certs
crypto
Documentation Networking fixes for 5.16-rc5, including fixes from bpf, can and netfilter. 2021-12-09 11:26:44 -08:00
drivers wireless-drivers fixes for v5.16 2021-12-15 14:43:07 +00:00
fs netfs: fix parameter of cleanup() 2021-12-07 15:47:09 +00:00
include mptcp: add missing documented NL params 2021-12-14 18:49:40 -08:00
init
ipc
kernel Networking fixes for 5.16-rc5, including fixes from bpf, can and netfilter. 2021-12-09 11:26:44 -08:00
lib Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-08 16:06:44 -08:00
LICENSES
mm Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-08 16:06:44 -08:00
net netfilter: fix regression in looped (broad|multi)cast's MAC handling 2021-12-16 00:06:24 +01:00
samples
scripts
security
sound
tools selftests: mlxsw: Add a test case for MAC profiles consolidation 2021-12-14 12:56:10 +00:00
usr
virt
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MAINTAINERS wireless-drivers fixes for v5.16 2021-12-15 14:43:07 +00:00
Makefile Makefile: Do not quote value for CONFIG_CC_IMPLICIT_FALLTHROUGH 2021-12-06 16:42:47 -08:00
README

README 

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.