[gnurl] 21/411: select.h: make socket validation macros test for INVALID_SOCKET

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nikita pushed a commit to branch master
in repository gnurl.

commit 0f7c332f9f36f792a7903760b2a8db45091ed8b6
Author: Marc Hoersken <info@marc-hoersken.de>
AuthorDate: Mon Aug 3 15:54:08 2020 +0200

    select.h: make socket validation macros test for INVALID_SOCKET
    
    With Winsock the valid range is [0..INVALID_SOCKET-1] according to
    https://docs.microsoft.com/en-us/windows/win32/winsock/socket-data-type-2
    
    Reviewed-by: Jay Satiro
    Reviewed-by: Marcel Raad
    Reviewed-by: Daniel Stenberg
    
    Closes #5760
---
 lib/select.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/select.h b/lib/select.h
index 95181f467..c9cc5c2e8 100644
--- a/lib/select.h
+++ b/lib/select.h
@@ -94,12 +94,23 @@ int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* 
writes,
                        fd_set* excepts, struct timeval *tv);
 #endif
 
-/* Winsock and TPF sockets are not in range [0..FD_SETSIZE-1], which
+/* TPF sockets are not in range [0..FD_SETSIZE-1], which
    unfortunately makes it impossible for us to easily check if they're valid
+
+   With Winsock the valid range is [0..INVALID_SOCKET-1] according to
+   https://docs.microsoft.com/en-us/windows/win32/winsock/socket-data-type-2
 */
-#if defined(USE_WINSOCK) || defined(TPF)
+#if defined(TPF)
 #define VALID_SOCK(x) 1
 #define VERIFY_SOCK(x) Curl_nop_stmt
+#elif defined(USE_WINSOCK)
+#define VALID_SOCK(s) ((s) < INVALID_SOCKET)
+#define VERIFY_SOCK(x) do { \
+  if(!VALID_SOCK(x)) { \
+    SET_SOCKERRNO(WSAEINVAL); \
+    return -1; \
+  } \
+} while(0)
 #else
 #define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))
 #define VERIFY_SOCK(x) do { \

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