From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- Documentation/gpu/v3d.rst | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 Documentation/gpu/v3d.rst (limited to 'Documentation/gpu/v3d.rst') diff --git a/Documentation/gpu/v3d.rst b/Documentation/gpu/v3d.rst new file mode 100644 index 000000000..543f7fbf5 --- /dev/null +++ b/Documentation/gpu/v3d.rst @@ -0,0 +1,28 @@ +===================================== + drm/v3d Broadcom V3D Graphics Driver +===================================== + +.. kernel-doc:: drivers/gpu/drm/v3d/v3d_drv.c + :doc: Broadcom V3D Graphics Driver + +GPU buffer object (BO) management +--------------------------------- + +.. kernel-doc:: drivers/gpu/drm/v3d/v3d_bo.c + :doc: V3D GEM BO management support + +Address space management +=========================================== +.. kernel-doc:: drivers/gpu/drm/v3d/v3d_mmu.c + :doc: Broadcom V3D MMU + +GPU Scheduling +=========================================== +.. kernel-doc:: drivers/gpu/drm/v3d/v3d_sched.c + :doc: Broadcom V3D scheduling + +Interrupts +-------------- + +.. kernel-doc:: drivers/gpu/drm/v3d/v3d_irq.c + :doc: Interrupt management for the V3D engine -- cgit v1.3.1