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[ Upstream commitb00683422f] There is a reference count error in error path code and a potential race in check_rkey() in rxe_resp.c. When looking up the rkey for a memory window the reference to the mw from rxe_lookup_mw() is dropped before a reference is taken on the mr referenced by the mw. If the mr is destroyed immediately after the call to rxe_put(mw) the mr pointer is unprotected and may end up pointing at freed memory. The rxe_get(mr) call should take place before the rxe_put(mw) call. All errors in check_rkey() call rxe_put(mw) if mw is not NULL but it was already called after the above. The mw pointer should be set to NULL after the rxe_put(mw) call to prevent this from happening. Fixes:cdd0b85675("RDMA/rxe: Implement memory access through MWs") Link: https://lore.kernel.org/r/20230517211509.1819998-1-rpearsonhpe@gmail.com Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.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.
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.