[release/8.0-staging] fix SendTo with SocketAsyncEventArgs #99695
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Backport of #98134 to release/8.0-staging
Fixes #97965 and #99863 -- a regression from PR #90086 (in 8.0).
/cc @wfurt
Customer Impact
This is regression caused by 8.0 changes (PR #90086). Traditionally it is possible to use
SocketAsyncEventArgs
multiple times but that no longer works forSendTo
method. Starting with 8.0 we either fail to send the data or we can send them to wrong endpoint which leads to privacy concerns.Reported by 2 external customers in #97965 and #99863
Regression
Yes, introduced by PR #90086
Testing
Added targeted test case for reusing
SocketAsyncEventArgs
withSendTo
method.Validated by a customer on 9.0 build with the fix.
Risk
Small - scoped only to UDP code path using
SocketAsyncEventArgs
(Task-based and synchronous code paths are OK) ... which is a rarely used combo.The fix is relatively small and the issue is fully understood.