intel_link_probe() could return error and dev_get_drvdata() will return null in such case. So we have to test link->cdns after link->cdns = dev_get_drvdata(&ldev->auxdev.dev); Otherwise, we will meet the "kernel NULL pointer dereference" error.
Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- drivers/soundwire/intel_init.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c index 5b32a2ffd376..5ef5bd0defab 100644 --- a/drivers/soundwire/intel_init.c +++ b/drivers/soundwire/intel_init.c @@ -250,6 +250,15 @@ static struct sdw_intel_ctx link = &ldev->link_res; link->cdns = dev_get_drvdata(&ldev->auxdev.dev);
+ if (!link->cdns) { + dev_err(&adev->dev, "failed to get link->cdns\n"); + /* + * 1 will be subtracted from i in the err label, but we need to call + * intel_link_dev_unregister for this ldev, so plus 1 now + */ + i++; + goto err; + } list_add_tail(&link->list, &ctx->link_list); bus = &link->cdns->bus; /* Calculate number of slaves */