drm/rockchip: cdn-dp: fix a possible NULL pointer dereference in cdn_dp_enable()

bivvy · bivvy · commit eea24fe7e976 · 2020-10-29T17:31:16.000+08:00
Change-Id: Ibf24dadd08e871d0531dab517d7f1e1f6ebeb206
Signed-off-by: Wyon Bi &lt;bivvy.bi@rock-chips.com&gt;
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -729,7 +729,7 @@ static int cdn_dp_enable(struct cdn_dp_device *dp)
 	}
 
 	/* Enable hdcp if it's desired */
-	if (dp->connector.state->content_protection ==
+	if (dp->connector.state && dp->connector.state->content_protection ==
 	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
 		ret = cdn_dp_start_hdcp1x_auth(dp);
 

Original file line number	Diff line number	Diff line change
`@@ -729,7 +729,7 @@ static int cdn_dp_enable(struct cdn_dp_device *dp)`
`729`	`729`	`}`
`730`	`730`
`731`	`731`	`/* Enable hdcp if it's desired */`
`732`		`- if (dp->connector.state->content_protection ==`
	`732`	`+ if (dp->connector.state && dp->connector.state->content_protection ==`
`733`	`733`	`DRM_MODE_CONTENT_PROTECTION_DESIRED)`
`734`	`734`	`ret = cdn_dp_start_hdcp1x_auth(dp);`
`735`	`735`