# HG changeset patch
# User mbaesken
# Date 1487848575 -3600
#      Thu Feb 23 12:16:15 2017 +0100
# Node ID 66988cd813e38c21d3b55ed6565a2e0e13eb2a40
# Parent  b2661d26e55650cc0bf4c17e4faf6fb5bb53723b
8175000 : jexec fails to execute simple helloworld.jar

diff --git a/src/java.base/unix/native/launcher/jexec.c b/src/java.base/unix/native/launcher/jexec.c
--- a/src/java.base/unix/native/launcher/jexec.c
+++ b/src/java.base/unix/native/launcher/jexec.c
@@ -331,8 +331,9 @@
                 off_t end   = start  + xlen;
 
                 if (end <= count) {
-                    end -= 4; // make sure there are 4 bytes to read at start
-                    while (start < end) {
+                    // make sure there are 4 bytes to read at start
+                    end -= 3;
+                    while ((start < end) && (start < count-3)) {
                         off_t xhid  = SH(buf, start);
                         off_t xdlen = SH(buf, start + 2);