CVE-2025-40032

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> PCI: endpoint: pci-epf-test: Add NULL check for DMA channels before release<br /> <br /> The fields dma_chan_tx and dma_chan_rx of the struct pci_epf_test can be<br /> NULL even after EPF initialization. Then it is prudent to check that<br /> they have non-NULL values before releasing the channels. Add the checks<br /> in pci_epf_test_clean_dma_chan().<br /> <br /> Without the checks, NULL pointer dereferences happen and they can lead<br /> to a kernel panic in some cases:<br /> <br /> Unable to handle kernel NULL pointer dereference at virtual address 0000000000000050<br /> Call trace:<br /> dma_release_channel+0x2c/0x120 (P)<br /> pci_epf_test_epc_deinit+0x94/0xc0 [pci_epf_test]<br /> pci_epc_deinit_notify+0x74/0xc0<br /> tegra_pcie_ep_pex_rst_irq+0x250/0x5d8<br /> irq_thread_fn+0x34/0xb8<br /> irq_thread+0x18c/0x2e8<br /> kthread+0x14c/0x210<br /> ret_from_fork+0x10/0x20<br /> <br /> [mani: trimmed the stack trace]