[lwip-devel] [bug #16830] err_tcp() posts to connection mailbox when no pend on the mailbox is active

[Jonathan Larmour]

Follow-up Comment #2, bug #16830 (project lwip):

I can confirm the problem exists. I can't offer a simple fix - I think a more
radical overhaul would be needed given the requirements for thread safety, and
probably involving something protected with the SYS_ARCH_PROTECT stuff.

What I did want to say is that this is not the only problem with the err_tcp
communication mechanism: errors can result in one of these null messages
being left in conn->mbox when netconn_delete is called. OSes do not freeing
mboxes with messages in - doing so might imply a memory leak. I am attaching
a patch I used in my own code, but I didn't contribute it because of the
problem indicated by the FIXME comment.



(file #12041)
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Additional Item Attachment:

File name: lwip.netconndelete.free.mbox.patch Size:1 KB


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