From 5afc1161ca31a643bf0cd14f7a96f1a2b953efec Mon Sep 17 00:00:00 2001
From: Felipe Oliveira Carvalho <felipekde@gmail.com>
Date: Fri, 28 Mar 2014 00:11:57 -0300
Subject: [PATCH] Avoid a seg fault when exiting after OOM error

I'm debugging OOM behavior using http://www.nongnu.org/failmalloc/ on Linux.

gdb environment:

```
set env LD_PRELOAD=libfailmalloc.so
set env FAILMALLOC_SPACE=0xF00000
```

SEGV was happening like this:

```
Starting program: /home/felipe/code/neovim/build/bin/nvim
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Vim: Error: Out of memory.

Program received signal SIGSEGV, Segmentation fault.
0x00000000004d3719 in getout (exitval=1) at
/home/felipe/code/neovim/src/main.c:836
836       if (*p_viminfo != NUL)
(gdb)
```

After the fix it works as expected:

```
(gdb) set environment LD_PRELOAD=libfailmalloc.so
(gdb) set environment FAILMALLOC_SPACE=0xF00000
(gdb) r
Starting program: /home/felipe/code/neovim/build/bin/nvim
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Vim: Error: Out of memory.
Vim: Finished.
[Inferior 1 (process 21505) exited with code 01]
(gdb)
```
---
 src/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.c b/src/main.c
index b1e6aa7810..a8a2efbc8a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -834,7 +834,7 @@ void getout(int exitval)
     apply_autocmds(EVENT_VIMLEAVEPRE, NULL, NULL, FALSE, curbuf);
   }
 
-  if (*p_viminfo != NUL)
+  if (p_viminfo && *p_viminfo != NUL)
     /* Write out the registers, history, marks etc, to the viminfo file */
     write_viminfo(NULL, FALSE);