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, 44 insertions, 0 deletions

diff --git a/drivers/net/usb/Makefile b/drivers/net/usb/Makefile
new file mode 100644
index 000000000..4964f7b32
--- /dev/null
+++ b/drivers/net/usb/Makefile
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for USB Network drivers
+#
+
+obj-$(CONFIG_USB_CATC)		+= catc.o
+obj-$(CONFIG_USB_KAWETH)	+= kaweth.o
+obj-$(CONFIG_USB_PEGASUS)	+= pegasus.o
+obj-$(CONFIG_USB_RTL8150)	+= rtl8150.o
+obj-$(CONFIG_USB_RTL8152)	+= r8152.o
+obj-$(CONFIG_USB_HSO)		+= hso.o
+obj-$(CONFIG_USB_LAN78XX)	+= lan78xx.o
+obj-$(CONFIG_USB_NET_AX8817X)	+= asix.o
+asix-y := asix_devices.o asix_common.o ax88172a.o
+obj-$(CONFIG_USB_NET_AX88179_178A)      += ax88179_178a.o
+obj-$(CONFIG_USB_NET_CDCETHER)	+= cdc_ether.o
+obj-$(CONFIG_USB_NET_CDC_EEM)	+= cdc_eem.o
+obj-$(CONFIG_USB_NET_DM9601)	+= dm9601.o
+obj-$(CONFIG_USB_NET_SR9700)	+= sr9700.o
+obj-$(CONFIG_USB_NET_SR9800)	+= sr9800.o
+obj-$(CONFIG_USB_NET_SMSC75XX)	+= smsc75xx.o
+obj-$(CONFIG_USB_NET_SMSC95XX)	+= smsc95xx.o
+obj-$(CONFIG_USB_NET_GL620A)	+= gl620a.o
+obj-$(CONFIG_USB_NET_NET1080)	+= net1080.o
+obj-$(CONFIG_USB_NET_PLUSB)	+= plusb.o
+obj-$(CONFIG_USB_NET_RNDIS_HOST)	+= rndis_host.o
+obj-$(CONFIG_USB_NET_CDC_SUBSET_ENABLE)	+= cdc_subset.o
+obj-$(CONFIG_USB_NET_ZAURUS)	+= zaurus.o
+obj-$(CONFIG_USB_NET_MCS7830)	+= mcs7830.o
+obj-$(CONFIG_USB_USBNET)	+= usbnet.o
+obj-$(CONFIG_USB_NET_INT51X1)	+= int51x1.o
+obj-$(CONFIG_USB_CDC_PHONET)	+= cdc-phonet.o
+obj-$(CONFIG_USB_NET_KALMIA)	+= kalmia.o
+obj-$(CONFIG_USB_IPHETH)	+= ipheth.o
+obj-$(CONFIG_USB_SIERRA_NET)	+= sierra_net.o
+obj-$(CONFIG_USB_NET_CX82310_ETH)	+= cx82310_eth.o
+obj-$(CONFIG_USB_NET_CDC_NCM)	+= cdc_ncm.o
+obj-$(CONFIG_USB_NET_HUAWEI_CDC_NCM)	+= huawei_cdc_ncm.o
+obj-$(CONFIG_USB_VL600)		+= lg-vl600.o
+obj-$(CONFIG_USB_NET_QMI_WWAN)	+= qmi_wwan.o
+obj-$(CONFIG_USB_NET_CDC_MBIM)	+= cdc_mbim.o
+obj-$(CONFIG_USB_NET_CH9200)	+= ch9200.o
+obj-$(CONFIG_USB_NET_AQC111)	+= aqc111.o
+obj-$(CONFIG_USB_RTL8153_ECM)	+= r8153_ecm.o