svn commit: r1618823 - /subversion/trunk/subversion/libsvn_diff/diff_file.c

[rhuijben]

Author: rhuijben
Date: Tue Aug 19 09:31:09 2014
New Revision: 1618823

URL: http://svn.apache.org/r1618823
Log:
* subversion/libsvn_diff/diff_file.c
  (context_saver_stream_write): Avoid buffer overflows when the context size
    would be 0.

Modified:
    subversion/trunk/subversion/libsvn_diff/diff_file.c

Modified: subversion/trunk/subversion/libsvn_diff/diff_file.c
URL: 
http://svn.apache.org/viewvc/subversion/trunk/subversion/libsvn_diff/diff_file.c?rev=1618823&r1=1618822&r2=1618823&view=diff
==============================================================================
--- subversion/trunk/subversion/libsvn_diff/diff_file.c (original)
+++ subversion/trunk/subversion/libsvn_diff/diff_file.c Tue Aug 19 09:31:09 2014
@@ -1968,10 +1968,14 @@ context_saver_stream_write(void *baton,
                            apr_size_t *len)
 {
   context_saver_t *cs = baton;
-  cs->data[cs->next_slot] = data;
-  cs->len[cs->next_slot] = *len;
-  cs->next_slot = (cs->next_slot + 1) % cs->context_size;
-  cs->total_written++;
+
+  if (cs->context_size > 0)
+    {
+      cs->data[cs->next_slot] = data;
+      cs->len[cs->next_slot] = *len;
+      cs->next_slot = (cs->next_slot + 1) % cs->context_size;
+      cs->total_written++;
+    }
   return SVN_NO_ERROR;
 }