[PATCH xserver] Fix id in error when resource does not exist

[Peter Harris]

Always set client->errorValue before returning an error.


Test program:

#include <stdio.h>
#include <xcb/xcb.h>
#include <xcb/xproto.h>

#define BAD_VALUE 0xFACE0FF

int main(int argc, char *argv[]) {
    int screen = 0;
    xcb_connection_t *c = xcb_connect(NULL, &screen);
    if (!c) {
        printf("Cannot connect\n");
        return 1;
    }

    xcb_void_cookie_t tok = xcb_free_gc_checked(c, BAD_VALUE);
    xcb_g_context_error_t *err = (xcb_g_context_error_t *)xcb_request_check(c, tok);
    if (!err) {
        printf("Unexpected request success\n");
        return 1;
    }
    if (err->bad_value != BAD_VALUE) {
        printf("Error: Got 0x%X, expected 0x%X\n", err->bad_value, BAD_VALUE);
        return 1;
    }
    printf("Success! Got expected bad value of 0x%X\n", BAD_VALUE);
    return 0;
}

---

I was confused for a while when a BadGC error report had the XID of a drawable
in it.

 dix/resource.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dix/resource.c b/dix/resource.c
index ad71b24..68efd24 100644
--- a/dix/resource.c
+++ b/dix/resource.c
@@ -1220,11 +1220,13 @@ dixLookupResourceByType(void **result, XID id, RESTYPE rtype,
             if (res->id == id && res->type == rtype)
                 break;
     }
+    if (client) {
+        client->errorValue = id;
+    }
     if (!res)
         return resourceTypes[rtype & TypeMask].errorValue;
 
     if (client) {
-        client->errorValue = id;
         cid = XaceHook(XACE_RESOURCE_ACCESS, client, id, res->type,
                        res->value, RT_NONE, NULL, mode);
         if (cid == BadValue)
@@ -1253,11 +1255,13 @@ dixLookupResourceByClass(void **result, XID id, RESTYPE rclass,
             if (res->id == id && (res->type & rclass))
                 break;
     }
+    if (client) {
+        client->errorValue = id;
+    }
     if (!res)
         return BadValue;
 
     if (client) {
-        client->errorValue = id;
         cid = XaceHook(XACE_RESOURCE_ACCESS, client, id, res->type,
                        res->value, RT_NONE, NULL, mode);
         if (cid != Success)
-- 
2.7.4