ws2_32: Don't read more than necessary from the inputs in select().

.NET Framework / old .NET Core seems to allocate not more space than necessary for the fd_set inputs, so if the allocation fell on the edge of the end of the heap, Wine tried to read past it. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52259Signed-off-by: Torge Matthies <openglfreak@googlemail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ws2_32: Don't read more than necessary from the inputs in select().
ae0209a3 · Torge Matthies · Alexandre Julliard · 4d38fe92 · ae0209a3
Commit ae0209a3 authored Dec 24, 2021 by Torge Matthies Committed by Alexandre Julliard Dec 26, 2021
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Showing with 6 additions and 6 deletions

socket.c dlls/ws2_32/socket.c +6 -6

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--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -2395,9 +2395,9 @@ int WINAPI select( int count, fd_set *read_ptr, fd_set *write_ptr,
    FD_ZERO( &read );
    FD_ZERO( &write );
    FD_ZERO( &except );
-    if (read_ptr) read = *read_ptr;
+    if (read_ptr) read.fd_count = read_ptr->fd_count;
-    if (write_ptr) write = *write_ptr;
+    if (write_ptr) write.fd_count = write_ptr->fd_count;
-    if (except_ptr) except = *except_ptr;
+    if (except_ptr) except.fd_count = except_ptr->fd_count;
    if (!(sync_event = get_sync_event())) return -1;
@@ -2408,7 +2408,7 @@ int WINAPI select( int count, fd_set *read_ptr, fd_set *write_ptr,
    for (i = 0; i < read.fd_count; ++i)
    {
-        params->sockets[params->count].socket = read.fd_array[i];
+        params->sockets[params->count].socket = read.fd_array[i] = read_ptr->fd_array[i];
        params->sockets[params->count].flags = AFD_POLL_READ | AFD_POLL_ACCEPT | AFD_POLL_HUP;
        ++params->count;
        poll_socket = read.fd_array[i];
@@ -2416,7 +2416,7 @@ int WINAPI select( int count, fd_set *read_ptr, fd_set *write_ptr,
    for (i = 0; i < write.fd_count; ++i)
    {
-        params->sockets[params->count].socket = write.fd_array[i];
+        params->sockets[params->count].socket = write.fd_array[i] = write_ptr->fd_array[i];
        params->sockets[params->count].flags = AFD_POLL_WRITE;
        ++params->count;
        poll_socket = write.fd_array[i];
@@ -2424,7 +2424,7 @@ int WINAPI select( int count, fd_set *read_ptr, fd_set *write_ptr,
    for (i = 0; i < except.fd_count; ++i)
    {
-        params->sockets[params->count].socket = except.fd_array[i];
+        params->sockets[params->count].socket = except.fd_array[i] = except_ptr->fd_array[i];
        params->sockets[params->count].flags = AFD_POLL_OOB | AFD_POLL_CONNECT_ERR;
        ++params->count;
        poll_socket = except.fd_array[i];