Comment 0 for bug 1497883

I'm connecting via ssh to our platform running dropbear. If I cat /var/log/syslog, I'm seeing the connection break with the following:
Write failed: Broken pipe

The syslog is about 2MB size.
`xxd /dev/zero` can reproduce the issue 100%.
[Impact]

 * In fact it is really an annoying bug due to I can't visit my syslog or other large file via cat.

[Test Case]
The minimum reproducer should be:
 * system A running a dropbear as a ssh server.
 * ssh username@systemA from system B. (A and B should be different computer.)
 * xxd /dev/zero
 * the connection will be broken.

[Regression Potential]
 * I find the patch from upstream. And it already been merged. So I think it's safe to merge it into ubuntu.

[Other Info]
 * The latest dropbear-2015.68 can't reproduce the issue.
 * After a bisect I find this patch fixed the issue: https://github.com/mkj/dropbear/commit/db688e3
 * There is a bit conflict if you apply above commit. The fixed version is attached.