Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  drm/msm: don't tear down KMS twice when KMS init fails  When priv->kms_init() (mdp4_kms_init() / mdp5_kms_init()) fails partway through, both display drivers already tear their KMS state down via mdp4_destroy() / mdp5_kms_destroy() before returning the error. The common error path in msm_drm_init() then runs msm_drm_uninit() -> msm_drm_kms_uninit(), which tries to destroy the very same KMS a second time, which causes a use-after-free crash.  Bring MDP4/MDP5 in line with the DPU driver whose dpu_kms_init() doesn't perform error cleanup on the failure. Let the common path own the cleanup, instead of freeing the KMS from their error paths.  The crash trace for the reference:    __lock_acquire from lock_acquire (kernel/locking/lockdep.c:5906 kernel/locking/lockdep.c:5863)   lock_acquire from touch_wq_lockdep_map (kernel/workqueue.c:4094 (discriminator 1))   touch_wq_lockdep_map from __flush_workqueue (kernel/workqueue.c:4136)   __flush_workqueue from msm_drm_kms_uninit (drivers/gpu/drm/msm/msm_kms.c:243 (discriminator 33))   msm_drm_kms_uninit from msm_drm_uninit (drivers/gpu/drm/msm/msm_drv.c:93)   msm_drm_uninit from msm_drm_init (drivers/gpu/drm/msm/msm_drv.c:184)   msm_drm_init from try_to_bring_up_aggregate_device (drivers/base/component.c:249 drivers/base/component.c:227)   try_to_bring_up_aggregate_device from __component_add (drivers/base/component.c:269 drivers/base/component.c:748)   __component_add from dsi_host_attach (drivers/gpu/drm/msm/dsi/dsi_host.c:1739)   dsi_host_attach from mipi_dsi_attach (drivers/gpu/drm/drm_mipi_dsi.c:383)   mipi_dsi_attach from sharp_nt_panel_probe (drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c:247)  Patchwork: https://patchwork.freedesktop.org/patch/742068/