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22e81af523
commit 6dde0cfcb36e4d5b3de35b75696937478441eed4 upstream.
When last_recv is updated to store the last receive sequence number, it is
assuming that nothing is modifying in parallel while:
* check for outdated packets is done
* out of order check is performed (and packets are stored in out-of-order
queue)
* the out-of-order queue was searched for closed gaps
* sequence number for next ack is calculated
Nothing of that was actually protected. It could therefore happen that the
last_recv was updated multiple times in parallel and the final sequence
number was calculated with deltas which had no connection to the sequence
number they were added to.
Lock this whole region with the same lock which was already used to protect
the unacked (out-of-order) list.
Cc: stable@kernel.org
Fixes: 33a3bb4a33 ("batman-adv: throughput meter implementation")
[ Switch to pre-splitted tp_vars structure names ]
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.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.
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.