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linux/drivers/pci/endpoint
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Shin'ichiro Kawasaki 85afa9ea12 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

Fixes: 8353813c88 ("PCI: endpoint: Enable DMA tests for endpoints with DMA capabilities")
Fixes: 5ebf3fc59b ("PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
[mani: trimmed the stack trace]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250916025756.34807-1-shinichiro.kawasaki@wdc.com
2025-09-16 12:11:04 +05:30
..
functions PCI: endpoint: pci-epf-test: Add NULL check for DMA channels before release 2025-09-16 12:11:04 +05:30
Kconfig PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller 2025-07-24 16:51:17 -05:00
Makefile PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller 2025-07-24 16:51:17 -05:00
pci-ep-cfs.c PCI: endpoint: Fix configfs group removal on driver teardown 2025-06-25 16:09:12 -06:00
pci-ep-msi.c PCI: endpoint: pci-ep-msi: Fix NULL vs IS_ERR() check in pci_epf_write_msi_msg() 2025-08-11 16:28:33 +05:30
pci-epc-core.c PCI: endpoint: Align pci_epc_set_msix(), pci_epc_ops::set_msix() nr_irqs encoding 2025-05-28 16:47:56 -05:00
pci-epc-mem.c PCI: endpoint: Improve pci_epc_mem_alloc_addr() 2024-10-12 17:25:54 +05:30
pci-epf-core.c Merge branch 'pci/endpoint/doorbell' 2025-07-31 16:11:45 -05:00