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Index: head/sys/kern/uipc_socket.c
===================================================================
--- head/sys/kern/uipc_socket.c
+++ head/sys/kern/uipc_socket.c
@@ -1557,8 +1557,10 @@
#endif
if (uio != NULL)
resid = uio->uio_resid;
- else
+ else if ((top->m_flags & M_PKTHDR) != 0)
resid = top->m_pkthdr.len;
+ else
+ resid = m_length(top, NULL);
/*
* In theory resid should be unsigned. However, space must be
* signed, as it might be less than 0 if we over-committed, and we

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