[PATCH xserver v4 2/2] randr: Do not update ConnectionInfo if NULL

[Olivier Fourdan]

RRScreenSizeNotify() will update the connection information block, but
if this occurs during initialization before ConnectionInfo is even
initialized, this will lead to a crash.

Simply check for ConnectionInfo prior to update it to avoid the crash.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95337
Signed-off-by: Olivier Fourdan <ofourdan at redhat.com>
---
 v2: Move test in RREditConnectionInfo()
 v3: Copy pasta failed
 v4: "ranrd" typo in subject

 randr/rrscreen.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/randr/rrscreen.c b/randr/rrscreen.c
index d0ca91e..b5e2090 100644
--- a/randr/rrscreen.c
+++ b/randr/rrscreen.c
@@ -41,6 +41,9 @@ RREditConnectionInfo(ScreenPtr pScreen)
     int screen = 0;
     int d;
 
+    if (ConnectionInfo == NULL)
+        return;
+
     connSetup = (xConnSetup *) ConnectionInfo;
     vendor = (char *) connSetup + sizeof(xConnSetup);
     formats = (xPixmapFormat *) ((char *) vendor +
-- 
2.7.4