[gimp] 790783 - buffer overread in XCF parser if version field...

[Michael Natterer <mitch src gnome org>]

commit 702c4227e8b6169f781e4bb5ae4b5733f51ab126
Author: Hanno Boeck <hanno hboeck de>
Date:   Mon Nov 27 00:37:29 2017 +0100

    790783 - buffer overread in XCF parser if version field...
    
    ...has no null terminator
    
    Check for the presence of '\0' before using atoi() on the version
    string. Patch slightly modified (mitch).

 app/xcf/xcf.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/app/xcf/xcf.c b/app/xcf/xcf.c
index 620c92d..7cc6944 100644
--- a/app/xcf/xcf.c
+++ b/app/xcf/xcf.c
@@ -293,7 +293,8 @@ xcf_load_stream (Gimp          *gimp,
     {
       info.file_version = 0;
     }
-  else if (id[9] == 'v')
+  else if (id[9]  == 'v' &&
+           id[13] == '\0')
     {
       info.file_version = atoi (id + 10);
     }