From 272fa1817091117d078a22252a03d3161dfc7b0f Mon Sep 17 00:00:00 2001
From: Jeffrey Smith <whydoubt@gmail.com>
Date: Thu, 15 Feb 2018 23:47:46 -0600
Subject: os: avoid uninitialized offsets in backtrace

When xorg_backtrace calls unw_get_proc_name and an error occurs, offset
might not be set for the current frame.

Initialize offset for each frame so that the offset from another frame
cannot be used inadvertently.

Signed-off-by: Jeff Smith <whydoubt@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
---
 os/backtrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/os/backtrace.c b/os/backtrace.c
index 9e3e38edf..619bf145e 100644
--- a/os/backtrace.c
+++ b/os/backtrace.c
@@ -78,6 +78,7 @@ xorg_backtrace(void)
             break;
         }
 
+        off = 0;
         ret = unw_get_proc_name(&cursor, procname, 256, &off);
         if (ret && ret != -UNW_ENOMEM) {
             if (ret != -UNW_EUNSPEC)
-- 
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