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, 54 insertions, 0 deletions

diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
new file mode 100644
index 000000000..e6b1c1180
--- /dev/null
+++ b/drivers/bluetooth/Makefile
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux Bluetooth HCI device drivers.
+#
+
+obj-$(CONFIG_BT_HCIVHCI)	+= hci_vhci.o
+obj-$(CONFIG_BT_HCIUART)	+= hci_uart.o
+obj-$(CONFIG_BT_HCIBCM203X)	+= bcm203x.o
+obj-$(CONFIG_BT_HCIBCM4377)	+= hci_bcm4377.o
+obj-$(CONFIG_BT_HCIBPA10X)	+= bpa10x.o
+obj-$(CONFIG_BT_HCIBFUSB)	+= bfusb.o
+
+obj-$(CONFIG_BT_HCIBTUSB)	+= btusb.o
+obj-$(CONFIG_BT_HCIBTSDIO)	+= btsdio.o
+
+obj-$(CONFIG_BT_INTEL)		+= btintel.o
+obj-$(CONFIG_BT_INTEL_PCIE)	+= btintel_pcie.o btintel.o
+obj-$(CONFIG_BT_ATH3K)		+= ath3k.o
+obj-$(CONFIG_BT_MRVL)		+= btmrvl.o
+obj-$(CONFIG_BT_MRVL_SDIO)	+= btmrvl_sdio.o
+obj-$(CONFIG_BT_MTKSDIO)	+= btmtksdio.o
+obj-$(CONFIG_BT_MTKUART)	+= btmtkuart.o
+obj-$(CONFIG_BT_QCOMSMD)	+= btqcomsmd.o
+obj-$(CONFIG_BT_BCM)		+= btbcm.o
+obj-$(CONFIG_BT_RTL)		+= btrtl.o
+obj-$(CONFIG_BT_QCA)		+= btqca.o
+obj-$(CONFIG_BT_MTK)		+= btmtk.o
+
+obj-$(CONFIG_BT_VIRTIO)		+= virtio_bt.o
+obj-$(CONFIG_BT_NXPUART)	+= btnxpuart.o
+
+obj-$(CONFIG_BT_HCIUART_NOKIA)	+= hci_nokia.o
+
+obj-$(CONFIG_BT_HCIRSI)		+= btrsi.o
+
+btmrvl-y			:= btmrvl_main.o
+btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o
+
+hci_uart-y				:= hci_ldisc.o
+hci_uart-$(CONFIG_BT_HCIUART_SERDEV)	+= hci_serdev.o
+hci_uart-$(CONFIG_BT_HCIUART_H4)	+= hci_h4.o
+hci_uart-$(CONFIG_BT_HCIUART_BCSP)	+= hci_bcsp.o
+hci_uart-$(CONFIG_BT_HCIUART_LL)	+= hci_ll.o
+hci_uart-$(CONFIG_BT_HCIUART_ATH3K)	+= hci_ath.o
+hci_uart-$(CONFIG_BT_HCIUART_3WIRE)	+= hci_h5.o
+hci_uart-$(CONFIG_BT_HCIUART_INTEL)	+= hci_intel.o
+hci_uart-$(CONFIG_BT_HCIUART_BCM)	+= hci_bcm.o
+hci_uart-$(CONFIG_BT_HCIUART_QCA)	+= hci_qca.o
+hci_uart-$(CONFIG_BT_HCIUART_AG6XX)	+= hci_ag6xx.o
+hci_uart-$(CONFIG_BT_HCIUART_MRVL)	+= hci_mrvl.o
+hci_uart-$(CONFIG_BT_HCIUART_AML)	+= hci_aml.o
+hci_uart-objs				:= $(hci_uart-y)
+
+CONTEXT_ANALYSIS := y