log_xxd(): do not log with negative length

Thanks to Godfrey Chung for the bug report https://archives.neohapsis.com/archives/dev/muscle/2012-q1/0043.html git-svn-id: svn:https://anonscm.debian.org/svn/pcsclite/trunk/PCSC@6229 0ce88b0d-b2fd-0310-8134-9614164e65ea
LudovicRousseau · Feb 21, 2012 · 8cba22a · 8cba22a
1 parent 9ae5023
commit 8cba22a
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/debuglog.c b/src/debuglog.c
@@ -202,6 +202,10 @@ void log_xxd(const int priority, const char *msg, const unsigned char *buffer,
  || (DEBUGLOG_NO_DEBUG == LogMsgType))
  return;
 
+ /* len is an error value? */
+ if (len < 0)
+ return;
+
  log_xxd_always(priority, msg, buffer, len);
 } /* log_xxd */