[PATCH 1/3] ws2_32: WSARecvMsg allows a NULL control buffer when no control messages arrive

[Damjan Jovanovic]

Wine's WSARecvFrom() cannot distinguish between:
1. truncation during conversion of cmsghdrs from *nix to Windows,
which is an error.
2. a NULL WSAMSG.Control.buf passed in by the application, which is valid
   when there is no control data to convert.

Wine always treats it as case (1) and reports an error.

Closes bug 43286.

Signed-off-by: Damjan Jovanovic 
---
 dlls/ws2_32/socket.c     |  8 +++++---
 dlls/ws2_32/tests/sock.c | 17 +++++++++++++++--
 2 files changed, 20 insertions(+), 5 deletions(-)