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, 27 insertions, 0 deletions

diff --git a/drivers/pinctrl/intel/Makefile b/drivers/pinctrl/intel/Makefile
new file mode 100644
index 000000000..d0d868c9a
--- /dev/null
+++ b/drivers/pinctrl/intel/Makefile
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0
+# Intel pin control drivers
+
+obj-$(CONFIG_PINCTRL_BAYTRAIL)		+= pinctrl-baytrail.o
+obj-$(CONFIG_PINCTRL_CHERRYVIEW)	+= pinctrl-cherryview.o
+obj-$(CONFIG_PINCTRL_LYNXPOINT)		+= pinctrl-lynxpoint.o
+obj-$(CONFIG_PINCTRL_TANGIER)		+= pinctrl-tangier.o
+obj-$(CONFIG_PINCTRL_MERRIFIELD)	+= pinctrl-merrifield.o
+obj-$(CONFIG_PINCTRL_MOOREFIELD)	+= pinctrl-moorefield.o
+obj-$(CONFIG_PINCTRL_INTEL)		+= pinctrl-intel.o
+obj-$(CONFIG_PINCTRL_INTEL_PLATFORM)	+= pinctrl-intel-platform.o
+obj-$(CONFIG_PINCTRL_ALDERLAKE)		+= pinctrl-alderlake.o
+obj-$(CONFIG_PINCTRL_BROXTON)		+= pinctrl-broxton.o
+obj-$(CONFIG_PINCTRL_CANNONLAKE)	+= pinctrl-cannonlake.o
+obj-$(CONFIG_PINCTRL_CEDARFORK)		+= pinctrl-cedarfork.o
+obj-$(CONFIG_PINCTRL_DENVERTON)		+= pinctrl-denverton.o
+obj-$(CONFIG_PINCTRL_ELKHARTLAKE)	+= pinctrl-elkhartlake.o
+obj-$(CONFIG_PINCTRL_EMMITSBURG)	+= pinctrl-emmitsburg.o
+obj-$(CONFIG_PINCTRL_GEMINILAKE)	+= pinctrl-geminilake.o
+obj-$(CONFIG_PINCTRL_ICELAKE)		+= pinctrl-icelake.o
+obj-$(CONFIG_PINCTRL_JASPERLAKE)	+= pinctrl-jasperlake.o
+obj-$(CONFIG_PINCTRL_LAKEFIELD)		+= pinctrl-lakefield.o
+obj-$(CONFIG_PINCTRL_LEWISBURG)		+= pinctrl-lewisburg.o
+obj-$(CONFIG_PINCTRL_METEORLAKE)	+= pinctrl-meteorlake.o
+obj-$(CONFIG_PINCTRL_METEORPOINT)	+= pinctrl-meteorpoint.o
+obj-$(CONFIG_PINCTRL_SUNRISEPOINT)	+= pinctrl-sunrisepoint.o
+obj-$(CONFIG_PINCTRL_TIGERLAKE)		+= pinctrl-tigerlake.o