[gimp] Bug 701120: Opening fuzzed .pnm-file causes stack buffer overflow

[Massimo Valentini <mvalentini src gnome org>]

commit ac98dd47511c422e170bc2aac934dd47ae4d1d3f
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Sat Jun 1 17:30:43 2013 +0200

    Bug 701120: Opening fuzzed .pnm-file causes stack buffer overflow
    
    increase BUFLEN to avoid appending the nul terminator '\0'
    past the end of 'buf'

 plug-ins/common/file-pnm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plug-ins/common/file-pnm.c b/plug-ins/common/file-pnm.c
index feab67a..516c1dc 100644
--- a/plug-ins/common/file-pnm.c
+++ b/plug-ins/common/file-pnm.c
@@ -482,7 +482,7 @@ load_image (const gchar  *filename,
   gint32 volatile image_ID = -1;
   gint32          layer_ID;
   int             fd;           /* File descriptor */
-  char            buf[BUFLEN];  /* buffer for random things like scanning */
+  char            buf[BUFLEN + 4];  /* buffer for random things like scanning */
   PNMInfo        *pnminfo;
   PNMScanner * volatile scan;
   int             ctr;