From 970ede67de0e3f6a1e707ec99ae49d80bf3f2966 Mon Sep 17 00:00:00 2001 From: Haoxiang Li Date: Tue, 23 Jun 2026 22:05:39 +0800 Subject: [PATCH] tty: serial: pch_uart: add check for pci_get_slot() Add check for pci_get_slot() to prevent a potetial null pointer dereference in pch_request_dma(). Signed-off-by: Haoxiang Li Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260623140539.2272473-1-haoxiang_li2024@163.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/pch_uart.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index 5f7f073f285e..db5c62b0322f 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -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;