From: Yang Yingliang yangyingliang@huawei.com

[ Upstream commit a2f6ed4a44721d3a9fdf4da7e0743cb13866bf61 ]

It will cause null-ptr-deref if platform_get_resource_byname() returns NULL, we need check the return value.

Signed-off-by: Yang Yingliang yangyingliang@huawei.com Link: https://lore.kernel.org/r/20210615013922.784296-10-yangyingliang@huawei.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/fsl/fsl_xcvr.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/sound/soc/fsl/fsl_xcvr.c b/sound/soc/fsl/fsl_xcvr.c index 6dd0a5fcd455..dc7f914816c6 100644 --- a/sound/soc/fsl/fsl_xcvr.c +++ b/sound/soc/fsl/fsl_xcvr.c @@ -1205,6 +1205,10 @@ static int fsl_xcvr_probe(struct platform_device *pdev)

rx_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rxfifo"); tx_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "txfifo"); + if (!rx_res || !tx_res) { + dev_err(dev, "could not find rxfifo or txfifo resource\n"); + return -EINVAL; + } xcvr->dma_prms_rx.chan_name = "rx"; xcvr->dma_prms_tx.chan_name = "tx"; xcvr->dma_prms_rx.addr = rx_res->start;