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Anssi Hannula e202ffd9e5 can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB [ Upstream commit `ef79f00be7` ] can_put_echo_skb() takes ownership of the SKB and it may be freed during or after the call. However, xilinx_can xcan_write_frame() keeps using SKB after the call. Fix that by only calling can_put_echo_skb() after the code is done touching the SKB. The tx_lock is held for the entire xcan_write_frame() execution and also on the can_get_echo_skb() side so the order of operations does not matter. An earlier fix commit `3d3c817c3a` ("can: xilinx_can: Fix usage of skb memory") did not move the can_put_echo_skb() call far enough. Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi> Fixes: `1598efe57b` ("can: xilinx_can: refactor code in preparation for CAN FD support") Link: https://patch.msgid.link/20250822095002.168389-1-anssi.hannula@bitwise.fi [mkl: add "commit" in front of sha1 in patch description] [mkl: fix indention] Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-10-02 13:39:03 +02:00
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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.