From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() 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 Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- net/can/Makefile | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 net/can/Makefile (limited to 'net/can/Makefile') diff --git a/net/can/Makefile b/net/can/Makefile new file mode 100644 index 000000000..58f2c31c1 --- /dev/null +++ b/net/can/Makefile @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the Linux Controller Area Network core. +# + +obj-$(CONFIG_CAN) += can.o +can-y := af_can.o +can-$(CONFIG_PROC_FS) += proc.o + +obj-$(CONFIG_CAN_RAW) += can-raw.o +can-raw-y := raw.o + +obj-$(CONFIG_CAN_BCM) += can-bcm.o +can-bcm-y := bcm.o + +obj-$(CONFIG_CAN_GW) += can-gw.o +can-gw-y := gw.o + +obj-$(CONFIG_CAN_J1939) += j1939/ + +obj-$(CONFIG_CAN_ISOTP) += can-isotp.o +can-isotp-y := isotp.o -- cgit v1.3.1