From d07ed419cf333c92f5b7376c2f97a899b7359161 Mon Sep 17 00:00:00 2001
From: Jan Kratochvil <jan.kratochvil@redhat.com>
Date: Tue, 12 Jul 2011 20:59:03 +0000
Subject: gdb/ 	Fix occasional crash of CTRL-C during DWARF read in. 	*
 dwarf2read.c (dwarf2_mark_helper): Return on NULL CU.

---
 gdb/dwarf2read.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'gdb/dwarf2read.c')

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index a5bf1f7..fde5b6a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -15455,6 +15455,13 @@ dwarf2_mark_helper (void **slot, void *data)
   struct dwarf2_per_cu_data *per_cu;
 
   per_cu = (struct dwarf2_per_cu_data *) *slot;
+
+  /* cu->dependencies references may not yet have been ever read if QUIT aborts
+     reading of the chain.  As such dependencies remain valid it is not much
+     useful to track and undo them during QUIT cleanups.  */
+  if (per_cu->cu == NULL)
+    return 1;
+
   if (per_cu->cu->mark)
     return 1;
   per_cu->cu->mark = 1;
-- 
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