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It's ok to pass atomic check successfully if an atomic commit tries to disable the display pipeline which the connector belongs to. That is, when the crtc or the best_encoder pointers in struct drm_connector_state are NULL, drm_atomic_helper_connector_hdmi_check() should return 0. Without the check against the NULL pointers, drm_default_rgb_quant_range() called by drm_atomic_helper_connector_hdmi_check() would dereference the NULL pointer to_match in drm_match_cea_mode(). Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Call trace: drm_default_rgb_quant_range+0x0/0x4c (P) drm_bridge_connector_atomic_check+0x20/0x2c drm_atomic_helper_check_modeset+0x488/0xc78 drm_atomic_helper_check+0x20/0xa4 drm_atomic_check_only+0x4b8/0x984 drm_atomic_commit+0x48/0xc4 drm_framebuffer_remove+0x44c/0x530 drm_mode_rmfb_work_fn+0x7c/0xa0 process_one_work+0x150/0x294 worker_thread+0x2dc/0x3dc kthread+0x130/0x204 ret_from_fork+0x10/0x20 Fixes: |
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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.