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 --- drivers/net/wan/Makefile | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 drivers/net/wan/Makefile (limited to 'drivers/net/wan/Makefile') diff --git a/drivers/net/wan/Makefile b/drivers/net/wan/Makefile new file mode 100644 index 000000000..00e9b7ee1 --- /dev/null +++ b/drivers/net/wan/Makefile @@ -0,0 +1,65 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the Linux network (wan) device drivers. +# +# 3 Aug 2000, Christoph Hellwig +# Rewritten to use lists instead of if-statements. +# + +obj-$(CONFIG_HDLC) += hdlc.o +obj-$(CONFIG_HDLC_RAW) += hdlc_raw.o +obj-$(CONFIG_HDLC_RAW_ETH) += hdlc_raw_eth.o +obj-$(CONFIG_HDLC_CISCO) += hdlc_cisco.o +obj-$(CONFIG_HDLC_FR) += hdlc_fr.o +obj-$(CONFIG_HDLC_PPP) += hdlc_ppp.o +obj-$(CONFIG_HDLC_X25) += hdlc_x25.o + +obj-y += framer/ + +obj-$(CONFIG_FARSYNC) += farsync.o + +obj-$(CONFIG_LAPBETHER) += lapbether.o +obj-$(CONFIG_N2) += n2.o +obj-$(CONFIG_C101) += c101.o +obj-$(CONFIG_WANXL) += wanxl.o +obj-$(CONFIG_PCI200SYN) += pci200syn.o +obj-$(CONFIG_PC300TOO) += pc300too.o +obj-$(CONFIG_IXP4XX_HSS) += ixp4xx_hss.o +obj-$(CONFIG_FSL_QMC_HDLC) += fsl_qmc_hdlc.o +obj-$(CONFIG_FSL_UCC_HDLC) += fsl_ucc_hdlc.o +obj-$(CONFIG_SLIC_DS26522) += slic_ds26522.o + +clean-files := wanxlfw.inc +$(obj)/wanxl.o: $(obj)/wanxlfw.inc + +CROSS_COMPILE_M68K = m68k-linux-gnu- + +ifeq ($(CONFIG_WANXL_BUILD_FIRMWARE),y) +ifeq ($(ARCH),m68k) + M68KCC = $(CC) + M68KLD = $(LD) +else + M68KCC = $(CROSS_COMPILE_M68K)gcc + M68KLD = $(CROSS_COMPILE_M68K)ld +endif + +quiet_cmd_build_wanxlfw = BLDFW $@ + cmd_build_wanxlfw = hexdump -ve '"\n" 16/1 "0x%02X,"' $< | \ + sed 's/0x ,//g;1s/^/static const u8 firmware[]={/;$$s/,$$/\n};\n/' > $@ + +$(obj)/wanxlfw.inc: $(obj)/wanxlfw.bin FORCE + $(call if_changed,build_wanxlfw) + +quiet_cmd_m68kld_bin_o = M68KLD $@ + cmd_m68kld_bin_o = $(M68KLD) --oformat binary -Ttext 0x1000 $< -o $@ + +$(obj)/wanxlfw.bin: $(obj)/wanxlfw.o FORCE + $(call if_changed,m68kld_bin_o) + +quiet_cmd_m68kas_o_S = M68KAS $@ + cmd_m68kas_o_S = $(M68KCC) -D__ASSEMBLY__ -Wp,-MD,$(depfile) -I$(srctree)/include/uapi -c -o $@ $< + +$(obj)/wanxlfw.o: $(src)/wanxlfw.S FORCE + $(call if_changed_dep,m68kas_o_S) +endif +targets += wanxlfw.inc wanxlfw.bin wanxlfw.o -- cgit v1.3.1