fix potential buffer overflow in lowranceusr4 reader.

diff --git a/lowranceusr4.cc b/lowranceusr4.cc
index f2470453e154d1c4528095a3a8669bb0e6f6bf1a..53436d8be5dd5ef571b615de5e33a5dc7bdf1bce 100644 (file)
--- a/lowranceusr4.cc
+++ b/lowranceusr4.cc
@@ -85,8 +85,8 @@ lowranceusr4_readstr(char* buf, const int maxlen, gbfile* file, int bytes_per_ch
     buf[0] = '\0'; /* seems len=-1 means no string */
     return 0;
   } else if (len) {
-    if (len > maxlen*bytes_per_char) {
-      len = maxlen*bytes_per_char;
+    if (len > maxlen) {
+      len = maxlen;
     }
     if (bytes_per_char == 1) {
       bytesread += gbfread(buf, 1, len, file);