From cbe50578f886cced15d32e9fe2a65324c6de53f4 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Fri, 17 Apr 2026 10:33:14 +1000
Subject: [PATCH] randr/rrsdispatch: reject invalid format in
 SProcRRChangeProviderProperty

No real effect here since we check stuff->format early in
ProcRRChangeProviderProperty anyway. But this just makes it a bit more
obvious (and more consistent with other functions).

Assisted-by: Claude:claude-claude-opus-4-6
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2200>
---
 randr/rrsdispatch.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/randr/rrsdispatch.c b/randr/rrsdispatch.c
index 2bc7dc1f6..cfd7afa4a 100644
--- a/randr/rrsdispatch.c
+++ b/randr/rrsdispatch.c
@@ -519,6 +519,9 @@ SProcRRChangeProviderProperty(ClientPtr client)
     case 32:
         SwapRestL(stuff);
         break;
+    default:
+        client->errorValue = stuff->format;
+        return BadValue;
     }
     return ProcRandrVector[stuff->randrReqType] (client);
 }