https://bz.apache.org/bugzilla/show_bug.cgi?id=62344
Bug ID: 62344
Summary: Failing variable interpolation and memory allocation
failure in ProxyHTMLURLMap
Product: Apache httpd-2
Version: 2.4.33
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy_html
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 35903
--> https://bz.apache.org/bugzilla/attachment.cgi?id=35903&action=edit
Fix variable interpolation and memory allocation failure in ProxyHTMLURLMap
The attached file ProxyHTMLURLMap-memory-allocation-failure.patch fixes a
potential memory allocation failure in ProxyHTMLURLMap in conjunction with a
failed variable interpolation.
To reproduce, enable variable interpolation in ProxyHTMLURLMap and use a
pattern with a variable and the pipe symbol | after the variable. For example:
SetEnv env replaced
ProxyHTMLEnable On
ProxyHTMLInterp On
ProxyHTMLURLMap / /${env}_and_|/subfolder" V
The problem is that in mod_proxy_html.c, interpolate_var(), searching for |
isn't restricted to within the variable ${...}.
This leads to a wrong variable interpolation and, depending on your
environment, a memory allocation failure.
If you enable trace1 logging for mod_proxy_html you will see something like
this:
[...] mod_proxy_html.c(744): Interpolating env}_and_ => /subfolder"
The attached patch fixes this:
[...] mod_proxy_html.c(750): Interpolating env => replaced
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