[gimp] file-psp: fix for bogus input data. Fixes bug #639203

[Simon Budig <simon src gnome org>]

commit 48ec15890e1751dede061f6d1f469b6508c13439
Author: Simon Budig <simon budig de>
Date:   Mon Feb 14 21:46:31 2011 +0100

    file-psp: fix for bogus input data. Fixes bug #639203

 plug-ins/common/file-psp.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/plug-ins/common/file-psp.c b/plug-ins/common/file-psp.c
index ef39d5b..04897d5 100644
--- a/plug-ins/common/file-psp.c
+++ b/plug-ins/common/file-psp.c
@@ -1197,6 +1197,10 @@ read_channel_data (FILE       *f,
             }
           else
             fread (buf, runcount, 1, f);
+
+          /* prevent buffer overflow for bogus data */
+          runcount = MIN (runcount, endq - q);
+
           if (bytespp == 1)
             {
               memmove (q, buf, runcount);