Hello All,
I am facing assertion fail issue in pbuf_free API. The code where assert fails is mentioned below.
if ((p->flags & PBUF_FLAG_IS_CUSTOM) != 0)
{
struct pbuf_custom *pc = (struct pbuf_custom *)p;
LWIP_ASSERT("pc->custom_free_function != NULL",
pc->custom_free_function != NULL);
pc->custom_free_function(p);
}
I have two queries :
1. Is it proper to typecast struct pbuf to struct pbuf_custom as in above code "struct pbuf_custom *pc = (struct pbuf_custom *)p;", as if the condition in if statement is true, then pbuf "p" should be a member of some struct of type pbuf_custom and hence typecasting like this is improper.
2. If the typecasting is proper:
Although its good to have assertion check, but may I know in which scenario this assertion can fail ? Because whenever the flag PBUF_FLAG_IS_CUSTOM is set only at one place i.e. in "pbuf_alloced_custom" API, and if that API returns properly, then custom_free_function member of strct pbuf_custom is always set to "ipfrag_free_pbuf_custom" and hence assertion fail should not happen.
Please help me out where I am going wrong in my understanding.
Thanks,
Arpit
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