[lwip-devel] [bug #35574] Lockup in httpd (the older non-SSI/CGI httpd)

[Bill Auerbach]

Follow-up Comment #7, bug #35574 (project lwip):

The issue was arg==NULL locking in the LWIP_ERROR.  It happened that len was 0
and my opinion the pointer isn't used with len==0 so maybe LWIP_ERROR
shouldn't fail on arg==NULL.

I'm not sure what happens in tcp_write with len==0 and arg!=NULL.

I agree with the NULL pointer check being done and that httpd shouldn't call
tcp_write with arg==NULL.

You're suggesting (I think) that calling tcp_write with len==0 is an API error
too which isn't now checked.  Maybe it should to catch an application doing
something unusual (at best).

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