[PATCH 0/1] MR3136: win32u: Avoid SEGV in QueryDisplayConfig when run as service.

[Tatsuyuki Ishi (＠ishitatsuyuki)]

The virtual_monitor used for non-interactive service executions do not have
an adapter set. Avoid segfaulting and poisoning the mutex in such cases.

/cc @rbernon

[PATCH 1/1] win32u: Avoid SEGV in QueryDisplayConfig when run as service.

[Tatsuyuki Ishi]

From: Tatsuyuki Ishi

The virtual_monitor used for non-interactive service executions do not have
an adapter set. Avoid segfaulting and poisoning the mutex in such cases.
---
 dlls/win32u/sysparams.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index 44ee33c80f0..acda600b43c 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -2569,6 +2569,9 @@ LONG WINAPI NtUserQueryDisplayConfig( UINT32 flags, UINT32 *paths_count, DISPLAY
         if (!(monitor->dev.state_flags & DISPLAY_DEVICE_ACTIVE))
             continue;

+        if (!monitor->adapter)
+            continue;
+
         adapter_index = monitor->adapter->id;
         gpu_luid = &monitor->adapter->gpu_luid;
         output_id = monitor->output_id;

[Rémi Bernon (＠rbernon)]

For the record, from a quick test it looks like QueryDisplayConfig returns ERROR_ACCESS_DENIED in services.

[PATCH 0/1] MR3136: win32u: Avoid SEGV in QueryDisplayConfig when run as service. - approved

[Rémi Bernon (＠rbernon)]

This merge request was approved by Rémi Bernon.