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If receiving a reply for an MST down request message times out, the thread receiving the reply in drm_dp_mst_handle_down_rep() could try to dereference the drm_dp_sideband_msg_tx txmsg request message after the thread waiting for the reply - calling drm_dp_mst_wait_tx_reply() - has timed out and freed txmsg, hence leading to a use-after-free in drm_dp_mst_handle_down_rep(). Prevent the above by holding the drm_dp_mst_topology_mgr::qlock in drm_dp_mst_handle_down_rep() for the whole duration txmsg is looked up from the request list and dereferenced. v2: Fix unlocking mgr->qlock after verify_rx_request_type() fails. Cc: Lyude Paul <lyude@redhat.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241203174632.2941402-1-imre.deak@intel.com |
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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 reStructuredText 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.