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 --- drivers/video/fbdev/mmp/Kconfig | 12 + drivers/video/fbdev/mmp/Makefile | 4 + drivers/video/fbdev/mmp/core.c | 239 ++++ drivers/video/fbdev/mmp/fb/Kconfig | 8 + drivers/video/fbdev/mmp/fb/Makefile | 2 + drivers/video/fbdev/mmp/fb/mmpfb.c | 661 ++++++++++ drivers/video/fbdev/mmp/fb/mmpfb.h | 41 + drivers/video/fbdev/mmp/hw/Kconfig | 17 + drivers/video/fbdev/mmp/hw/Makefile | 3 + drivers/video/fbdev/mmp/hw/mmp_ctrl.c | 575 +++++++++ drivers/video/fbdev/mmp/hw/mmp_ctrl.h | 1456 +++++++++++++++++++++++ drivers/video/fbdev/mmp/hw/mmp_spi.c | 167 +++ drivers/video/fbdev/mmp/panel/Kconfig | 6 + drivers/video/fbdev/mmp/panel/Makefile | 2 + drivers/video/fbdev/mmp/panel/tpo_tj032md01bw.c | 172 +++ 15 files changed, 3365 insertions(+) create mode 100644 drivers/video/fbdev/mmp/Kconfig create mode 100644 drivers/video/fbdev/mmp/Makefile create mode 100644 drivers/video/fbdev/mmp/core.c create mode 100644 drivers/video/fbdev/mmp/fb/Kconfig create mode 100644 drivers/video/fbdev/mmp/fb/Makefile create mode 100644 drivers/video/fbdev/mmp/fb/mmpfb.c create mode 100644 drivers/video/fbdev/mmp/fb/mmpfb.h create mode 100644 drivers/video/fbdev/mmp/hw/Kconfig create mode 100644 drivers/video/fbdev/mmp/hw/Makefile create mode 100644 drivers/video/fbdev/mmp/hw/mmp_ctrl.c create mode 100644 drivers/video/fbdev/mmp/hw/mmp_ctrl.h create mode 100644 drivers/video/fbdev/mmp/hw/mmp_spi.c create mode 100644 drivers/video/fbdev/mmp/panel/Kconfig create mode 100644 drivers/video/fbdev/mmp/panel/Makefile create mode 100644 drivers/video/fbdev/mmp/panel/tpo_tj032md01bw.c (limited to 'drivers/video/fbdev/mmp') diff --git a/drivers/video/fbdev/mmp/Kconfig b/drivers/video/fbdev/mmp/Kconfig new file mode 100644 index 000000000..5c6cc97c9 --- /dev/null +++ b/drivers/video/fbdev/mmp/Kconfig @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0-only +menuconfig MMP_DISP + tristate "Marvell MMP Display Subsystem support" + depends on CPU_PXA910 || CPU_MMP2 || COMPILE_TEST + help + Marvell Display Subsystem support. + +if MMP_DISP +source "drivers/video/fbdev/mmp/hw/Kconfig" +source "drivers/video/fbdev/mmp/panel/Kconfig" +source "drivers/video/fbdev/mmp/fb/Kconfig" +endif diff --git a/drivers/video/fbdev/mmp/Makefile b/drivers/video/fbdev/mmp/Makefile new file mode 100644 index 000000000..84204c04e --- /dev/null +++ b/drivers/video/fbdev/mmp/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_MMP_DISP) += mmp_disp.o hw/ panel/ fb/ + +mmp_disp-y += core.o diff --git a/drivers/video/fbdev/mmp/core.c b/drivers/video/fbdev/mmp/core.c new file mode 100644 index 000000000..3c35b0a3e --- /dev/null +++ b/drivers/video/fbdev/mmp/core.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * linux/drivers/video/mmp/common.c + * This driver is a common framework for Marvell Display Controller + * + * Copyright (C) 2012 Marvell Technology Group Ltd. + * Authors: Zhou Zhu + */ + +#include +#include +#include +#include +#include