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[ Upstream commit533555e5cb] xfrm_output_one() does not return a error code when there is no dst_entry attached to the skb, it is still possible crash with a NULL pointer dereference in xfrm_output_resume(). Fix it by return error code -EHOSTUNREACH. Fixes:9e14379378("xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry.") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@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.