[Bug 1964] _Chain_Is_first/last overshoot

Mon Nov 14 16:23:16 UTC 2011

https://www.rtems.org/bugzilla/show_bug.cgi?id=1964

--- Comment #7 from Gedare <gedare at rtems.org> 2011-11-14 10:23:16 CST ---
Created attachment 1378
  --> https://www.rtems.org/bugzilla/attachment.cgi?id=1378
check for null dereference in rtems chain api

I don't think passing head (tail) to is_first (is_last) is a legit use case for
the score, but possibly should be handled by the sapi layer for user apps.
Attached patch implements the check and also makes the call safe for chain
nodes that are not currently on a chain.

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