rpmsg: return fail if either source or destination address is zero

to help detect rpmsg_send is called before the endpoint
initialization or after the endpoint uninitialization

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

Author: xiaoxiang781216

lib/include/openamp/rpmsg.h

@@ -146,8 +146,8 @@ int rpmsg_send_offchannel_raw(struct rpmsg_endpoint *ept, uint32_t src,
  */
 static inline unsigned int is_rpmsg_ept_ready(struct rpmsg_endpoint *ept)
 {
-	return (ept->dest_addr != RPMSG_ADDR_ANY) &&
-		(ept->addr != RPMSG_ADDR_ANY);
+	return ept && ept->rdev && ept->dest_addr &&
+		ept->dest_addr != RPMSG_ADDR_ANY;
 }
 
 /**

lib/rpmsg/rpmsg.c

@@ -115,7 +115,7 @@ int rpmsg_send_offchannel_raw(struct rpmsg_endpoint *ept, uint32_t src,
 {
 	struct rpmsg_device *rdev;
 
-	if (!ept || !ept->rdev || !data || dst == RPMSG_ADDR_ANY)
+	if (!ept || !ept->rdev || !data || !dst || dst == RPMSG_ADDR_ANY)
 		return RPMSG_ERR_PARAM;
 
 	rdev = ept->rdev;