From bb766ef11227bd8c71ac65845d1930edd0eda40d Mon Sep 17 00:00:00 2001
From: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Date: Sat, 4 Nov 2017 23:06:29 +0100
Subject: [PATCH] randr: ProcRRGetOutputInfo: initialize memory

Running Xephyr under valgrind reveals that we're sending some
uninitialized memory over the wire (particularly, the leftover padding
that comes from rounding extraLen to the next 32-bit multiple).

Solve by calloc()ing the memory instead of malloc()ing (the alternative
would be to memset just the padding, but I'm not sure it's more
convenient.)

Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
---
 randr/rroutput.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/randr/rroutput.c b/randr/rroutput.c
index a8efec409..647f19a52 100644
--- a/randr/rroutput.c
+++ b/randr/rroutput.c
@@ -459,7 +459,7 @@ ProcRRGetOutputInfo(ClientPtr client)
 
     if (extraLen) {
         rep.length += bytes_to_int32(extraLen);
-        extra = malloc(extraLen);
+        extra = calloc(1, extraLen);
         if (!extra)
             return BadAlloc;
     }