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tty: serial: pch_uart: add check for pci_get_slot()

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Add check for pci_get_slot() to prevent a potetial
null pointer dereference in pch_request_dma().

Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260623140539.2272473-1-haoxiang_li2024@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Haoxiang Li
2026-06-23 22:05:39 +08:00
committed by Greg Kroah-Hartman
parent a9b2c446e3
commit 970ede67de
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/pch_uart.c
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@@ -678,6 +678,11 @@ static void pch_request_dma(struct uart_port *port)
/* Get DMA's dev information */
dma_dev = pci_get_slot(priv->pdev->bus,
PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0));
if (!dma_dev) {
dev_err(priv->port.dev, "%s: failed to get DMA device\n",
__func__);
return;
}
/* Set Tx DMA */
param = &priv->param_tx;