From: Nikhil Badola nikhil.badola@freescale.com
[ Upstream commit bc1e3a2dd0c9954fd956ac43ca2876bbea018c01 ]
Check memory resource existence before releasing it to avoid NULL pointer dereference
Signed-off-by: Nikhil Badola nikhil.badola@freescale.com Reviewed-by: Ran Wang ran.wang_1@nxp.com Reviewed-by: Peter Chen peter.chen@nxp.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/gadget/udc/fsl_udc_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c index be59309e848c3..d44b26d5b2a2c 100644 --- a/drivers/usb/gadget/udc/fsl_udc_core.c +++ b/drivers/usb/gadget/udc/fsl_udc_core.c @@ -2552,7 +2552,7 @@ static int fsl_udc_remove(struct platform_device *pdev) dma_pool_destroy(udc_controller->td_pool); free_irq(udc_controller->irq, udc_controller); iounmap(dr_regs); - if (pdata->operating_mode == FSL_USB2_DR_DEVICE) + if (res && (pdata->operating_mode == FSL_USB2_DR_DEVICE)) release_mem_region(res->start, resource_size(res));
/* free udc --wait for the release() finished */