dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel()grafted

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 <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Shivank Garg <shivankg@amd.com>
Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
new file mode 100644
index 000000000..3b249195c
--- /dev/null
+++ b/drivers/thermal/Makefile
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for sensor chip drivers.
+#
+CFLAGS_thermal_core.o		:= -I$(src)
+obj-$(CONFIG_THERMAL)		+= thermal_sys.o
+thermal_sys-y			+= thermal_core.o thermal_sysfs.o
+thermal_sys-y			+= thermal_trip.o thermal_helpers.o
+thermal_sys-y			+= thermal_thresholds.o
+
+# netlink interface to manage the thermal framework
+thermal_sys-$(CONFIG_THERMAL_NETLINK)		+= thermal_netlink.o
+
+thermal_sys-$(CONFIG_THERMAL_DEBUGFS)	+= thermal_debugfs.o
+
+# interface to/from other layers providing sensors
+thermal_sys-$(CONFIG_THERMAL_HWMON)		+= thermal_hwmon.o
+thermal_sys-$(CONFIG_THERMAL_OF)		+= thermal_of.o
+
+# governors
+CFLAGS_gov_power_allocator.o			:= -I$(src)
+thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE)	+= gov_fair_share.o
+thermal_sys-$(CONFIG_THERMAL_GOV_BANG_BANG)	+= gov_bang_bang.o
+thermal_sys-$(CONFIG_THERMAL_GOV_STEP_WISE)	+= gov_step_wise.o
+thermal_sys-$(CONFIG_THERMAL_GOV_USER_SPACE)	+= gov_user_space.o
+thermal_sys-$(CONFIG_THERMAL_GOV_POWER_ALLOCATOR)	+= gov_power_allocator.o
+
+# cpufreq cooling
+thermal_sys-$(CONFIG_CPU_FREQ_THERMAL)	+= cpufreq_cooling.o
+thermal_sys-$(CONFIG_CPU_IDLE_THERMAL)	+= cpuidle_cooling.o
+
+# devfreq cooling
+thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
+
+thermal_sys-$(CONFIG_PCIE_THERMAL) += pcie_cooling.o
+
+obj-$(CONFIG_K3_THERMAL)	+= k3_bandgap.o k3_j72xx_bandgap.o
+# platform thermal drivers
+obj-y				+= broadcom/
+obj-$(CONFIG_THERMAL_MMIO)		+= thermal_mmio.o
+obj-$(CONFIG_AIROHA_THERMAL)	+= airoha_thermal.o
+obj-$(CONFIG_SPEAR_THERMAL)	+= spear_thermal.o
+obj-$(CONFIG_SUN8I_THERMAL)     += sun8i_thermal.o
+obj-$(CONFIG_ROCKCHIP_THERMAL)	+= rockchip_thermal.o
+obj-y				+= renesas/
+obj-$(CONFIG_KIRKWOOD_THERMAL)  += kirkwood_thermal.o
+obj-y				+= samsung/
+obj-$(CONFIG_DOVE_THERMAL)	+= dove_thermal.o
+obj-$(CONFIG_DB8500_THERMAL)	+= db8500_thermal.o
+obj-$(CONFIG_ARMADA_THERMAL)	+= armada_thermal.o
+obj-$(CONFIG_IMX_THERMAL)	+= imx_thermal.o
+obj-$(CONFIG_IMX_SC_THERMAL)	+= imx_sc_thermal.o
+obj-$(CONFIG_IMX8MM_THERMAL)	+= imx8mm_thermal.o
+obj-$(CONFIG_IMX91_THERMAL)	+= imx91_thermal.o
+obj-$(CONFIG_MAX77620_THERMAL)	+= max77620_thermal.o
+obj-$(CONFIG_QORIQ_THERMAL)	+= qoriq_thermal.o
+obj-$(CONFIG_DA9062_THERMAL)	+= da9062-thermal.o
+obj-y				+= intel/
+obj-$(CONFIG_TI_SOC_THERMAL)	+= ti-soc-thermal/
+obj-y				+= st/
+obj-y				+= qcom/
+obj-y				+= tegra/
+obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
+obj-y				+= mediatek/
+obj-$(CONFIG_GENERIC_ADC_THERMAL)	+= thermal-generic-adc.o
+obj-$(CONFIG_UNIPHIER_THERMAL)	+= uniphier_thermal.o
+obj-$(CONFIG_AMLOGIC_THERMAL)     += amlogic_thermal.o
+obj-y				+= spacemit/
+obj-$(CONFIG_SPRD_THERMAL)	+= sprd_thermal.o
+obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL)	+= khadas_mcu_fan.o
+obj-$(CONFIG_LOONGSON2_THERMAL)	+= loongson2_thermal.o
+obj-$(CONFIG_THERMAL_CORE_TESTING)	+= testing/