Hi, Static analysis with Coverity has found an issue with the following commit: >From a092ab25fdaa445b821f5959e458350696fce44c Mon Sep 17 00:00:00 2001 From: Michael Walle <michael@xxxxxxxx> Date: Fri, 6 Mar 2020 22:44:31 +0100 Subject: [PATCH] tty: serial: fsl_lpuart: fix DMA mapping The analysis report is as follows for function lpuart_dma_rx_free in source drivers/tty/serial/fsl_lpuart.c : var_compare_op: Comparing chan to null implies that chan might be null. 1234 if (chan) 1235 dmaengine_terminate_all(chan); 1236 Dereference after null check (FORWARD_NULL) var_deref_op: Dereferencing null pointer chan. 1237 dma_unmap_sg(chan->device->dev, &sport->rx_sgl, 1, DMA_FROM_DEVICE); The check for chan being null implies it is may be null, however, the call to dma_unmap_sg dereferences chan which leads to a null pointer dereference issue. Colin
