Description
In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: pci-epf-test: Add NULL check for DMA channels before release The fields dma_chan_tx and dma_chan_rx of the struct pci_epf_test can be NULL even after EPF initialization. Then it is prudent to check that they have non-NULL values before releasing the channels. Add the checks in pci_epf_test_clean_dma_chan(). Without the checks, NULL pointer dereferences happen and they can lead to a kernel panic in some cases: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000050 Call trace: dma_release_channel+0x2c/0x120 (P) pci_epf_test_epc_deinit+0x94/0xc0 [pci_epf_test] pci_epc_deinit_notify+0x74/0xc0 tegra_pcie_ep_pex_rst_irq+0x250/0x5d8 irq_thread_fn+0x34/0xb8 irq_thread+0x18c/0x2e8 kthread+0x14c/0x210 ret_from_fork+0x10/0x20 [mani: trimmed the stack trace]
Product status
5ebf3fc59bd20d17df3ba26159787d13cf20d362 (git) before 6411f840a9b5c47c00ca8e004733de232553870d
5ebf3fc59bd20d17df3ba26159787d13cf20d362 (git) before 0c5ce6b6ccc22d486cc7239ed908cb0ae5363a7b
5ebf3fc59bd20d17df3ba26159787d13cf20d362 (git) before fb54ffd60064c4e5139a3eb216e877b1acae1c8b
5ebf3fc59bd20d17df3ba26159787d13cf20d362 (git) before 57f7fb0d1ac28540c0f6405c829bb9c3b89d8dba
5ebf3fc59bd20d17df3ba26159787d13cf20d362 (git) before 85afa9ea122dd9d4a2ead104a951d318975dcd25
5.7
Any version before 5.7
6.1.157 (semver)
6.6.113 (semver)
6.12.54 (semver)
6.17.3 (semver)
6.18-rc1 (original_commit_for_fix)
References
git.kernel.org/...c/6411f840a9b5c47c00ca8e004733de232553870d
git.kernel.org/...c/0c5ce6b6ccc22d486cc7239ed908cb0ae5363a7b
git.kernel.org/...c/fb54ffd60064c4e5139a3eb216e877b1acae1c8b
git.kernel.org/...c/57f7fb0d1ac28540c0f6405c829bb9c3b89d8dba
git.kernel.org/...c/85afa9ea122dd9d4a2ead104a951d318975dcd25
