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On 05/19/2016 01:53 PM, Andreas Schwab wrote:
fweimer@redhat.com (Florian Weimer) writes:The call is technically in a loop, and under certain circumstances (which are quite difficult to reproduce in a test case), alloca can be invoked repeatedly during a single call to clntudp_call. As a result, the available stack space can be exhausted (even though individual alloca sizes are bounded implicitly by what can fit into a UDP packet, as a side effect of the earlier successful send operation).If you use a VLA you can avoid that.
It's still a maintenance hazard for libtirpc because they might eventually support IPv6 jumbograms, which won't fit on the stack.
Florian
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