kernel/linux.git/drivers/gpu/drm/exynos, branch v6.12.80

drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free

2026-03-13T16:20:28+00:00

[ Upstream commit 52b330799e2d6f825ae2bb74662ec1b10eb954bb ] Exynos Virtual Display driver performs memory alloc/free operations without lock protection, which easily causes concurrency problem. For example, use-after-free can occur in race scenario like this: ``` CPU0 CPU1 CPU2 ---- ---- ---- vidi_connection_ioctl() if (vidi->connection) // true drm_edid = drm_edid_alloc(); // alloc drm_edid ... ctx->raw_edid = drm_edid; ... drm_mode_getconnector() drm_helper_probe_single_connector_modes() vidi_get_modes() if (ctx->raw_edid) // true drm_edid_dup(ctx->raw_edid); if (!drm_edid) // false ... vidi_connection_ioctl() if (vidi->connection) // false drm_edid_free(ctx->raw_edid); // free drm_edid ... drm_edid_alloc(drm_edid->edid) kmemdup(edid); // UAF!! ... ``` To prevent these vulns, at least in vidi_context, member variables related to memory alloc/free should be protected with ctx->lock. Cc: Signed-off-by: Jeongjun Park Signed-off-by: Inki Dae Signed-off-by: Sasha Levin

drm/exynos/vidi: Remove redundant error handling in vidi_get_modes()

2026-03-13T16:20:28+00:00

[ Upstream commit 0253dadc772e83aaa67aea8bf24a71e7ffe13cb0 ] In the vidi_get_modes() function, if either drm_edid_dup() or drm_edid_alloc() fails, the function will immediately return 0, indicating that no display modes can be retrieved. However, in the event of failure in these two functions, it is still necessary to call the subsequent drm_edid_connector_update() function with a NULL drm_edid as an argument. This ensures that operations such as connector settings are performed in its callee function, _drm_edid_connector_property_update. To maintain the integrity of the operation, redundant error handling needs to be removed. Signed-off-by: Wentao Liang Signed-off-by: Inki Dae Stable-dep-of: 52b330799e2d ("drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free") Signed-off-by: Sasha Levin

drm/exynos: vidi: fix to avoid directly dereferencing user pointer

2026-03-13T16:20:27+00:00

[ Upstream commit d4c98c077c7fb2dfdece7d605e694b5ea2665085 ] In vidi_connection_ioctl(), vidi->edid(user pointer) is directly dereferenced in the kernel. This allows arbitrary kernel memory access from the user space, so instead of directly accessing the user pointer in the kernel, we should modify it to copy edid to kernel memory using copy_from_user() and use it. Cc: Signed-off-by: Jeongjun Park Signed-off-by: Inki Dae Signed-off-by: Sasha Levin

drm/exynos: exynos7_drm_decon: remove ctx->suspended

2025-10-23T14:20:25+00:00

[ Upstream commit e1361a4f1be9cb69a662c6d7b5ce218007d6e82b ] Condition guards are found to be redundant, as the call flow is properly managed now, as also observed in the Exynos5433 DECON driver. Since state checking is no longer necessary, remove it. This also fixes an issue which prevented decon_commit() from decon_atomic_enable() due to an incorrect state change setting. Fixes: 96976c3d9aff ("drm/exynos: Add DECON driver") Cc: stable@vger.kernel.org Suggested-by: Inki Dae Signed-off-by: Kaustabh Chakraborty Signed-off-by: Inki Dae Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/exynos: exynos7_drm_decon: properly clear channels during bind

2025-10-23T14:20:24+00:00

[ Upstream commit 5f1a453974204175f20b3788824a0fe23cc36f79 ] The DECON channels are not cleared properly as the windows aren't shadow protected. When accompanied with an IOMMU, it pagefaults, and the kernel panics. Implement shadow protect/unprotect, along with a standalone update, for channel clearing to properly take effect. Signed-off-by: Kaustabh Chakraborty Signed-off-by: Inki Dae Stable-dep-of: e1361a4f1be9 ("drm/exynos: exynos7_drm_decon: remove ctx->suspended") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/exynos: exynos7_drm_decon: fix uninitialized crtc reference in functions

2025-10-23T14:20:24+00:00

[ Upstream commit d31bbacf783daf1e71fbe5c68df93550c446bf44 ] Modify the functions to accept a pointer to struct decon_context instead. Signed-off-by: Kaustabh Chakraborty Signed-off-by: Inki Dae Stable-dep-of: e1361a4f1be9 ("drm/exynos: exynos7_drm_decon: remove ctx->suspended") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/exynos: exynos7_drm_decon: add vblank check in IRQ handling

2025-07-17T16:37:01+00:00

commit b846350aa272de99bf6fecfa6b08e64ebfb13173 upstream. If there's support for another console device (such as a TTY serial), the kernel occasionally panics during boot. The panic message and a relevant snippet of the call stack is as follows: Unable to handle kernel NULL pointer dereference at virtual address 000000000000000 Call trace: drm_crtc_handle_vblank+0x10/0x30 (P) decon_irq_handler+0x88/0xb4 [...] Otherwise, the panics don't happen. This indicates that it's some sort of race condition. Add a check to validate if the drm device can handle vblanks before calling drm_crtc_handle_vblank() to avoid this. Cc: stable@vger.kernel.org Fixes: 96976c3d9aff ("drm/exynos: Add DECON driver") Signed-off-by: Kaustabh Chakraborty Signed-off-by: Inki Dae Signed-off-by: Greg Kroah-Hartman

drm/exynos: fimd: Guard display clock control with runtime PM calls

2025-07-10T14:04:48+00:00

[ Upstream commit 5d91394f236167ac624b823820faf4aa928b889e ] Commit c9b1150a68d9 ("drm/atomic-helper: Re-order bridge chain pre-enable and post-disable") changed the call sequence to the CRTC enable/disable and bridge pre_enable/post_disable methods, so those bridge methods are now called when CRTC is not yet enabled. This causes a lockup observed on Samsung Peach-Pit/Pi Chromebooks. The source of this lockup is a call to fimd_dp_clock_enable() function, when FIMD device is not yet runtime resumed. It worked before the mentioned commit only because the CRTC implemented by the FIMD driver was always enabled what guaranteed the FIMD device to be runtime resumed. This patch adds runtime PM guards to the fimd_dp_clock_enable() function to enable its proper operation also when the CRTC implemented by FIMD is not yet enabled. Fixes: 196e059a8a6a ("drm/exynos: convert clock_enable crtc callback to pipeline clock") Signed-off-by: Marek Szyprowski Reviewed-by: Tomi Valkeinen Signed-off-by: Inki Dae Signed-off-by: Sasha Levin

drm/exynos: hdmi: use eld_mutex to protect access to connector->eld

2025-02-17T09:04:47+00:00

[ Upstream commit 5e8436d334ed7f6785416447c50b42077c6503e0 ] Reading access to connector->eld can happen at the same time the drm_edid_to_eld() updates the data. Take the newly added eld_mutex in order to protect connector->eld from concurrent access. Reviewed-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-5-c9bce1ee8bea@linaro.org Signed-off-by: Dmitry Baryshkov Signed-off-by: Sasha Levin

Merge tag 'drm-next-2024-09-19' of https://gitlab.freedesktop.org/drm/kernel

2024-09-19T08:18:15+00:00

Pull drm updates from Dave Airlie: "This adds a couple of patches outside the drm core, all should be acked appropriately, the string and pstore ones are the main ones that come to mind. Otherwise it's the usual drivers, xe is getting enabled by default on some new hardware, we've changed the device number handling to allow more devices, and we added some optional rust code to create QR codes in the panic handler, an idea first suggested I think 10 years ago :-) string: - add mem_is_zero() core: - support more device numbers - use XArray for minor ids - add backlight constants - Split dma fence array creation into alloc and arm fbdev: - remove usage of old fbdev hooks kms: - Add might_fault() to drm_modeset_lock priming - Add dynamic per-crtc vblank configuration support dma-buf: - docs cleanup buddy: - Add start address support for trim function printk: - pass description to kmsg_dump scheduler: - Remove full_recover from drm_sched_start ttm: - Make LRU walk restartable after dropping locks - Allow direct reclaim to allocate local memory panic: - add display QR code (in rust) displayport: - mst: GUID improvements bridge: - Silence error message on -EPROBE_DEFER - analogix: Clean aup - bridge-connector: Fix double free - lt6505: Disable interrupt when powered off - tc358767: Make default DP port preemphasis configurable - lt9611uxc: require DRM_BRIDGE_ATTACH_NO_CONNECTOR - anx7625: simplify OF array handling - dw-hdmi: simplify clock handling - lontium-lt8912b: fix mode validation - nwl-dsi: fix mode vsync/hsync polarity xe: - Enable LunarLake and Battlemage support - Introducing Xe2 ccs modifiers for integrated and discrete graphics - rename xe perf to xe observation - use wb caching on DGFX for system memory - add fence timeouts - Lunar Lake graphics/media/display workarounds - Battlemage workarounds - Battlemage GSC support - GSC and HuC fw updates for LL/BM - use dma_fence_chain_free - refactor hw engine lookup and mmio access - enable priority mem read for Xe2 - Add first GuC BMG fw - fix dma-resv lock - Fix DGFX display suspend/resume - Use xe_managed for kernel BOs - Use reserved copy engine for user binds on faulting devices - Allow mixing dma-fence jobs and long-running faulting jobs - fix media TLB invalidation - fix rpm in TTM swapout path - track resources and VF state by PF i915: - Type-C programming fix for MTL+ - FBC cleanup - Calc vblank delay more accurately - On DP MST, Enable LT fallback for UHBR<->non-UHBR rates - Fix DP LTTPR detection - limit relocations to INT_MAX - fix long hangs in buddy allocator on DG2/A380 amdgpu: - Per-queue reset support - SDMA devcoredump support - DCN 4.0.1 updates - GFX12/VCN4/JPEG4 updates - Convert vbios embedded EDID to drm_edid - GFX9.3/9.4 devcoredump support - process isolation framework for GFX 9.4.3/4 - take IOMMU mappings into account for P2P DMA amdkfd: - CRIU fixes - HMM fix - Enable process isolation support for GFX 9.4.3/4 - Allow users to target recommended SDMA engines - KFD support for targetting queues on recommended SDMA engines radeon: - remove .load and drm_dev_alloc - Fix vbios embedded EDID size handling - Convert vbios embedded EDID to drm_edid - Use GEM references instead of TTM - r100 cp init cleanup - Fix potential overflows in evergreen CS offset tracking msm: - DPU: - implement DP/PHY mapping on SC8180X - Enable writeback on SM8150, SC8180X, SM6125, SM6350 - DP: - Enable widebus on all relevant chipsets - MSM8998 HDMI support - GPU: - A642L speedbin support - A615/A306/A621 support - A7xx devcoredump support ast: - astdp: Support AST2600 with VGA - Clean up HPD - Fix timeout loop for DP link training - reorganize output code by type (VGA, DP, etc) - convert to struct drm_edid - fix BMC handling for all outputs exynos: - drop stale MAINTAINERS pattern - constify struct loongson: - use GEM refcount over TTM mgag200: - Improve BMC handling - Support VBLANK intterupts - transparently support BMC outputs nouveau: - Refactor and clean up internals - Use GEM refcount over TTM's gm12u320: - convert to struct drm_edid gma500: - update i2c terms lcdif: - pixel clock fix host1x: - fix syncpoint IRQ during resume - use iommu_paging_domain_alloc() imx: - ipuv3: convert to struct drm_edid omapdrm: - improve error handling - use common helper for_each_endpoint_of_node() panel: - add support for BOE TV101WUM-LL2 plus DT bindings - novatek-nt35950: improve error handling - nv3051d: improve error handling - panel-edp: - add support for BOE NE140WUM-N6G - revert support for SDC ATNA45AF01 - visionox-vtdr6130: - improve error handling - use devm_regulator_bulk_get_const() - boe-th101mb31ig002: - Support for starry-er88577 MIPI-DSI panel plus DT - Fix porch parameter - edp: Support AOU B116XTN02.3, AUO B116XAN06.1, AOU B116XAT04.1, BOE NV140WUM-N41, BOE NV133WUM-N63, BOE NV116WHM-A4D, CMN N116BCA-EA2, CMN N116BCP-EA2, CSW MNB601LS1-4 - himax-hx8394: Support Microchip AC40T08A MIPI Display panel plus DT - ilitek-ili9806e: Support Densitron DMT028VGHMCMI-1D TFT plus DT - jd9365da: - Support Melfas lmfbx101117480 MIPI-DSI panel plus DT - Refactor for code sharing - panel-edp: fix name for HKC MB116AN01 - jd9365da: fix "exit sleep" commands - jdi-fhd-r63452: simplify error handling with DSI multi-style helpers - mantix-mlaf057we51: simplify error handling with DSI multi-style helpers - simple: - support Innolux G070ACE-LH3 plus DT bindings - support On Tat Industrial Company KD50G21-40NT-A1 plus DT bindings - st7701: - decouple DSI and DRM code - add SPI support - support Anbernic RG28XX plus DT bindings mediatek: - support alpha blending - remove cl in struct cmdq_pkt - ovl adaptor fix - add power domain binding for mediatek DPI controller renesas: - rz-du: add support for RZ/G2UL plus DT bindings rockchip: - Improve DP sink-capability reporting - dw_hdmi: Support 4k@60Hz - vop: - Support RGB display on Rockchip RK3066 - Support 4096px width sti: - convert to struct drm_edid stm: - Avoid UAF wih managed plane and CRTC helpers - Fix module owner - Fix error handling in probe - Depend on COMMON_CLK - ltdc: - Fix transparency after disabling plane - Remove unused interrupt tegra: - gr3d: improve PM domain handling - convert to struct drm_edid - Call drm_atomic_helper_shutdown() vc4: - fix PM during detect - replace DRM_ERROR() with drm_error() - v3d: simplify clock retrieval v3d: - Clean up perfmon virtio: - add DRM capset" * tag 'drm-next-2024-09-19' of https://gitlab.freedesktop.org/drm/kernel: (1326 commits) drm/xe: Fix missing conversion to xe_display_pm_runtime_resume drm/xe/xe2hpg: Add Wa_15016589081 drm/xe: Don't keep stale pointer to bo->ggtt_node drm/xe: fix missing 'xe_vm_put' drm/xe: fix build warning with CONFIG_PM=n drm/xe: Suppress missing outer rpm protection warning drm/xe: prevent potential UAF in pf_provision_vf_ggtt() drm/amd/display: Add all planes on CRTC to state for overlay cursor drm/i915/bios: fix printk format width drm/i915/display: Fix BMG CCS modifiers drm/amdgpu: get rid of bogus includes of fdtable.h drm/amdkfd: CRIU fixes drm/amdgpu: fix a race in kfd_mem_export_dmabuf() drm: new helper: drm_gem_prime_handle_to_dmabuf() drm/amdgpu/atomfirmware: Silence UBSAN warning drm/amdgpu: Fix kdoc entry in 'amdgpu_vm_cpu_prepare' drm/amd/amdgpu: apply command submission parser for JPEG v1 drm/amd/amdgpu: apply command submission parser for JPEG v2+ drm/amd/pm: fix the pp_dpm_pcie issue on smu v14.0.2/3 drm/amd/pm: update the features set on smu v14.0.2/3 ...