https://bz.apache.org/bugzilla/show_bug.cgi?id=64096
Bug ID: 64096
Summary: mod_cgi leaks memory after timeouts
Product: Apache httpd-2
Version: 2.4.39
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_cgi
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
There is a weird edge case in which mod_cgi 2.4.x leaks memory.
Basically, if a timeout happens and the request goes through the
`discard_script_output` function, the entire output of the cgi script is
buffered into memory.
This is actually fixed in trunk in r1867970 but would be helpful to cherry-pick
this particular fix (1-line change) to 2.4.x.
The comment from r1867970 (
https://svn.apache.org/viewvc/httpd/httpd/trunk/modules/generators/cgi_common.h?revision=1867970&view=markup
):
> * modules/generators/cgi_common.h (discard_script_output): Simplify
> slightly and ensure constant rather than unlimited memory
> consumption when discarding CGI script output (for e.g. a redirect
> response).
As far as I can tell before this change (e.g. 2.4.x currently), this function
not only consumes unlimited memory but retains it forever. I'll post the
example conf and CGI script I used to test that.
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