File U_util-set-errno-when-hitting-WL_MAP_MAX_OBJECTS.patch of Package wayland.28583

From c7fc1e79ca50402acdd8627dcdf7dd0286924d99 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Tue, 28 Jun 2022 11:59:26 +0200
Subject: [PATCH] util: set errno when hitting WL_MAP_MAX_OBJECTS

Callers may check errno when wl_map_insert_* functions return an
error (since [1]). Make sure it's always set to a meaningful value
when returning an error, otherwise callers might end up checking an
errno coming from a completely different function.

[1]: https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/205

Signed-off-by: Simon Ser <contact@emersion.fr>
Fixes: b19488c7154b ("util: Limit size of wl_map")
---
 src/wayland-util.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: wayland-1.19.0/src/wayland-util.c
===================================================================
--- wayland-1.19.0.orig/src/wayland-util.c
+++ wayland-1.19.0/src/wayland-util.c
@@ -29,6 +29,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "wayland-util.h"
 #include "wayland-private.h"
@@ -229,6 +230,7 @@ wl_map_insert_new(struct wl_map *map, ui
 		 * better make it a NULL so wl_map_for_each doesn't
 		 * dereference it later. */
 		entry->data = NULL;
+		errno = ENOSPC;
 		return 0;
 	}
 	entry->data = data;
@@ -251,8 +253,10 @@ wl_map_insert_at(struct wl_map *map, uin
 		i -= WL_SERVER_ID_START;
 	}
 
-	if (i > WL_MAP_MAX_OBJECTS)
+	if (i > WL_MAP_MAX_OBJECTS) {
+		errno = ENOSPC;
 		return -1;
+	}
 
 	count = entries->size / sizeof *start;
 	if (count < i)
@@ -288,8 +292,10 @@ wl_map_reserve_new(struct wl_map *map, u
 		i -= WL_SERVER_ID_START;
 	}
 
-	if (i > WL_MAP_MAX_OBJECTS)
+	if (i > WL_MAP_MAX_OBJECTS) {
+		errno = ENOSPC;
 		return -1;
+	}
 
 	count = entries->size / sizeof *start;
 	if (count < i)