It's always best, imo, to follow-up with a bugzilla entry with
description and patch.
Thx!!
On Mar 19, 2014, at 3:58 PM, Micha Lenk wrote:
> Hi Apache developers,
>
> next is a bug that causes mod_proxy_html to add some random characters (+html
> code) to HTML pages, if the document is smaller than 4 bytes. (Thomas, Ewald,
> this is issue #18378 in our Mantis). It looks like the output is from some
> kind of uninitialized memory. The added string sometimes matches part of a
> previously delivered request. Also, it looks like this only happens when
> doing multiple HTTP requests with the same browser and using HTTP Keep Alive.
>
> The root cause is that the charset guessing with xml2enc needs to consume at
> least 4 bytes from the document to come to a conclusion. The consumed bytes
> are buffered so that they can later get prepended to the output again. But
> apparently it is assumed that there are always at least 4 bytes available,
> which in some cases is not the case. In these cases the buffer may contain
> some bytes left behind from the previous request on the same connection.
>
> The attached patch fixes that issue by simply skipping documents smaller than
> 4 bytes. The rationale behind this is, that for HTML rewriting to do
> something useful, it needs to work on an absolute URL (i.e. including a
> schema). But as the schema "http" is already 4 bytes, there would be nothing
> to rewrite.
>
> The patch is based on httpd trunk, rev. 1579365.
>
> Please provide feedback whether I should file an issue in Apaches Bugzilla or
> whether this isn't needed in this case.
>
> Regards,
> Micha
>
