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 --- arch/powerpc/sysdev/Makefile | 50 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 arch/powerpc/sysdev/Makefile (limited to 'arch/powerpc/sysdev/Makefile') diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile new file mode 100644 index 000000000..0834a9a12 --- /dev/null +++ b/arch/powerpc/sysdev/Makefile @@ -0,0 +1,50 @@ +# SPDX-License-Identifier: GPL-2.0 + +mpic-msi-obj-$(CONFIG_PCI_MSI) += mpic_msi.o mpic_u3msi.o +obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y) +obj-$(CONFIG_MPIC_TIMER) += mpic_timer.o +obj-$(CONFIG_FSL_MPIC_TIMER_WAKEUP) += fsl_mpic_timer_wakeup.o +mpic-msgr-obj-$(CONFIG_MPIC_MSGR) += mpic_msgr.o +obj-$(CONFIG_MPIC) += mpic.o $(mpic-msi-obj-y) $(mpic-msgr-obj-y) +obj-$(CONFIG_PPC_EPAPR_HV_PIC) += ehv_pic.o +fsl-msi-obj-$(CONFIG_PCI_MSI) += fsl_msi.o +obj-$(CONFIG_PPC_MSI_BITMAP) += msi_bitmap.o + +obj-$(CONFIG_PPC_MPC106) += grackle.o +obj-$(CONFIG_PPC_DCR_NATIVE) += dcr-low.o +obj-$(CONFIG_U3_DART) += dart_iommu.o +obj-$(CONFIG_MMIO_NVRAM) += mmio_nvram.o +obj-$(CONFIG_FSL_SOC) += fsl_soc.o fsl_mpic_err.o +obj-$(CONFIG_FSL_PCI) += fsl_pci.o $(fsl-msi-obj-y) +obj-$(CONFIG_FSL_PMC) += fsl_pmc.o +obj-$(CONFIG_FSL_CORENET_RCPM) += fsl_rcpm.o +obj-$(CONFIG_FSL_LBC) += fsl_lbc.o +obj-$(CONFIG_FSL_GTM) += fsl_gtm.o +obj-$(CONFIG_FSL_RIO) += fsl_rio.o fsl_rmu.o +obj-$(CONFIG_TSI108_BRIDGE) += tsi108_pci.o tsi108_dev.o +obj-$(CONFIG_RTC_DRV_CMOS) += rtc_cmos_setup.o + +obj-$(CONFIG_PPC_INDIRECT_PCI) += indirect_pci.o +obj-$(CONFIG_PPC_I8259) += i8259.o +obj-$(CONFIG_IPIC) += ipic.o +obj-$(CONFIG_OF_RTC) += of_rtc.o + +obj-$(CONFIG_CPM) += cpm_common.o +obj-$(CONFIG_CPM2) += cpm2.o cpm2_pic.o cpm_gpio.o +obj-$(CONFIG_8xx_GPIO) += cpm_gpio.o +obj-$(CONFIG_QUICC_ENGINE) += cpm_common.o +obj-$(CONFIG_PPC_DCR) += dcr.o + +obj-$(CONFIG_PPC_MPC512x) += mpc5xxx_clocks.o +obj-$(CONFIG_PPC_MPC52xx) += mpc5xxx_clocks.o + +ifdef CONFIG_SUSPEND +obj-$(CONFIG_PPC_BOOK3S_32) += 6xx-suspend.o +endif + +obj-$(CONFIG_PPC_EARLY_DEBUG_MEMCONS) += udbg_memcons.o + +obj-$(CONFIG_PPC_XICS) += xics/ +obj-$(CONFIG_PPC_XIVE) += xive/ + +obj-$(CONFIG_GE_FPGA) += ge/ -- cgit v1.3.1