Hesham/wintun
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Skip packet on NBL allocation failure properly

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Should NBL allocation persist to fail, the receive ring could eventually
fill up as there will be no TunReturnNetBufferLists() calls to advance
its head.

Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-08-02 11:57:29 +02:00
parent 9d71da2d37
commit 408665270f
1 changed files with 2 additions and 0 deletions
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wintun.c
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@ -503,6 +503,8 @@ TunProcessReceiveData(_Inout_ TUN_CTX *Ctx)
if (!Nbl) if (!Nbl)
{ {
InterlockedIncrement64((LONG64 *)&Ctx->Statistics.ifInDiscards); InterlockedIncrement64((LONG64 *)&Ctx->Statistics.ifInDiscards);
KeWaitForSingleObject(&Ctx->Device.Receive.ActiveNbls.Empty, Executive, KernelMode, FALSE, NULL);
InterlockedSetU(&Ring->Head, RingHead);
continue; continue;
} }