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 --- net/rfkill/Kconfig | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 net/rfkill/Kconfig (limited to 'net/rfkill/Kconfig') diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig new file mode 100644 index 000000000..83a7af898 --- /dev/null +++ b/net/rfkill/Kconfig @@ -0,0 +1,34 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# RF switch subsystem configuration +# +menuconfig RFKILL + tristate "RF switch subsystem support" + help + Say Y here if you want to have control over RF switches + found on many WiFi and Bluetooth cards. + + To compile this driver as a module, choose M here: the + module will be called rfkill. + +# LED trigger support +config RFKILL_LEDS + bool + depends on RFKILL + depends on LEDS_TRIGGERS = y || RFKILL = LEDS_TRIGGERS + default y + +config RFKILL_INPUT + bool "RF switch input support" if EXPERT + depends on RFKILL + depends on INPUT = y || RFKILL = INPUT + default y if !EXPERT + +config RFKILL_GPIO + tristate "GPIO RFKILL driver" + depends on RFKILL + depends on GPIOLIB || COMPILE_TEST + default n + help + If you say yes here you get support of a generic gpio RFKILL + driver. -- cgit v1.3.1