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, 65 insertions, 0 deletions

diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile
new file mode 100644
index 000000000..c7bb1a881
--- /dev/null
+++ b/drivers/usb/serial/Makefile
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the USB serial device drivers.
+#
+
+# Object file lists.
+
+obj-$(CONFIG_USB_SERIAL)			+= usbserial.o
+
+usbserial-y := usb-serial.o generic.o bus.o
+
+usbserial-$(CONFIG_USB_SERIAL_CONSOLE)	+= console.o
+
+obj-$(CONFIG_USB_SERIAL_AIRCABLE)		+= aircable.o
+obj-$(CONFIG_USB_SERIAL_ARK3116)		+= ark3116.o
+obj-$(CONFIG_USB_SERIAL_BELKIN)			+= belkin_sa.o
+obj-$(CONFIG_USB_SERIAL_CH341)			+= ch341.o
+obj-$(CONFIG_USB_SERIAL_CP210X)			+= cp210x.o
+obj-$(CONFIG_USB_SERIAL_CYBERJACK)		+= cyberjack.o
+obj-$(CONFIG_USB_SERIAL_CYPRESS_M8)		+= cypress_m8.o
+obj-$(CONFIG_USB_SERIAL_DEBUG)			+= usb_debug.o
+obj-$(CONFIG_USB_SERIAL_DIGI_ACCELEPORT)	+= digi_acceleport.o
+obj-$(CONFIG_USB_SERIAL_EDGEPORT)		+= io_edgeport.o
+obj-$(CONFIG_USB_SERIAL_EDGEPORT_TI)		+= io_ti.o
+obj-$(CONFIG_USB_SERIAL_EMPEG)			+= empeg.o
+obj-$(CONFIG_USB_SERIAL_F81232)			+= f81232.o
+obj-$(CONFIG_USB_SERIAL_F8153X)			+= f81534.o
+obj-$(CONFIG_USB_SERIAL_FTDI_SIO)		+= ftdi_sio.o
+obj-$(CONFIG_USB_SERIAL_GARMIN)			+= garmin_gps.o
+obj-$(CONFIG_USB_SERIAL_IPAQ)			+= ipaq.o
+obj-$(CONFIG_USB_SERIAL_IPW)			+= ipw.o
+obj-$(CONFIG_USB_SERIAL_IR)			+= ir-usb.o
+obj-$(CONFIG_USB_SERIAL_IUU)			+= iuu_phoenix.o
+obj-$(CONFIG_USB_SERIAL_KEYSPAN)		+= keyspan.o
+obj-$(CONFIG_USB_SERIAL_KEYSPAN_PDA)		+= keyspan_pda.o
+obj-$(CONFIG_USB_SERIAL_KLSI)			+= kl5kusb105.o
+obj-$(CONFIG_USB_SERIAL_KOBIL_SCT)		+= kobil_sct.o
+obj-$(CONFIG_USB_SERIAL_MCT_U232)		+= mct_u232.o
+obj-$(CONFIG_USB_SERIAL_METRO)			+= metro-usb.o
+obj-$(CONFIG_USB_SERIAL_MOS7720)		+= mos7720.o
+obj-$(CONFIG_USB_SERIAL_MOS7840)		+= mos7840.o
+obj-$(CONFIG_USB_SERIAL_MXUPORT)		+= mxuport.o
+obj-$(CONFIG_USB_SERIAL_NAVMAN)			+= navman.o
+obj-$(CONFIG_USB_SERIAL_OMNINET)		+= omninet.o
+obj-$(CONFIG_USB_SERIAL_OPTICON)		+= opticon.o
+obj-$(CONFIG_USB_SERIAL_OPTION)			+= option.o
+obj-$(CONFIG_USB_SERIAL_OTI6858)		+= oti6858.o
+obj-$(CONFIG_USB_SERIAL_PL2303)			+= pl2303.o
+obj-$(CONFIG_USB_SERIAL_QCAUX)			+= qcaux.o
+obj-$(CONFIG_USB_SERIAL_QUALCOMM)		+= qcserial.o
+obj-$(CONFIG_USB_SERIAL_QT2)			+= quatech2.o
+obj-$(CONFIG_USB_SERIAL_SAFE)			+= safe_serial.o
+obj-$(CONFIG_USB_SERIAL_SIERRAWIRELESS)		+= sierra.o
+obj-$(CONFIG_USB_SERIAL_SIMPLE)			+= usb-serial-simple.o
+obj-$(CONFIG_USB_SERIAL_SPCP8X5)		+= spcp8x5.o
+obj-$(CONFIG_USB_SERIAL_SSU100)			+= ssu100.o
+obj-$(CONFIG_USB_SERIAL_SYMBOL)			+= symbolserial.o
+obj-$(CONFIG_USB_SERIAL_WWAN)			+= usb_wwan.o
+obj-$(CONFIG_USB_SERIAL_TI)			+= ti_usb_3410_5052.o
+obj-$(CONFIG_USB_SERIAL_UPD78F0730)		+= upd78f0730.o
+obj-$(CONFIG_USB_SERIAL_VISOR)			+= visor.o
+obj-$(CONFIG_USB_SERIAL_WISHBONE)		+= wishbone-serial.o
+obj-$(CONFIG_USB_SERIAL_WHITEHEAT)		+= whiteheat.o
+obj-$(CONFIG_USB_SERIAL_XR)			+= xr_serial.o
+obj-$(CONFIG_USB_SERIAL_XSENS_MT)		+= xsens_mt.o