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/input/misc/ad714x.h | 53 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 drivers/input/misc/ad714x.h (limited to 'drivers/input/misc/ad714x.h') diff --git a/drivers/input/misc/ad714x.h b/drivers/input/misc/ad714x.h new file mode 100644 index 000000000..dafa12325 --- /dev/null +++ b/drivers/input/misc/ad714x.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * AD714X CapTouch Programmable Controller driver (bus interfaces) + * + * Copyright 2009-2011 Analog Devices Inc. + */ + +#ifndef _AD714X_H_ +#define _AD714X_H_ + +#include +#include + +#define STAGE_NUM 12 + +struct device; +struct ad714x_platform_data; +struct ad714x_driver_data; +struct ad714x_chip; + +typedef int (*ad714x_read_t)(struct ad714x_chip *, unsigned short, unsigned short *, size_t); +typedef int (*ad714x_write_t)(struct ad714x_chip *, unsigned short, unsigned short); + +struct ad714x_chip { + unsigned short l_state; + unsigned short h_state; + unsigned short c_state; + unsigned short adc_reg[STAGE_NUM]; + unsigned short amb_reg[STAGE_NUM]; + unsigned short sensor_val[STAGE_NUM]; + + struct ad714x_platform_data *hw; + struct ad714x_driver_data *sw; + + int irq; + struct device *dev; + ad714x_read_t read; + ad714x_write_t write; + + struct mutex mutex; + + unsigned product; + unsigned version; + + __be16 xfer_buf[16] ____cacheline_aligned; + +}; + +extern const struct dev_pm_ops ad714x_pm; +struct ad714x_chip *ad714x_probe(struct device *dev, u16 bus_type, int irq, + ad714x_read_t read, ad714x_write_t write); + +#endif -- cgit v1.3.1