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From Stefan Eissing <>
Subject Re: [PATCH] mod_proxy_http2: fix theoretically possible segfault when parsing URL
Date Thu, 12 May 2016 15:13:26 GMT
Evgeny, both patches look fine. Thanks! Applied in r1743517.



> Am 12.05.2016 um 16:33 schrieb Evgeny Kotkov <>:
> This patch fixes a theoretically possible segfault in mod_proxy_http2.
> Please see the open_stream() function in h2_proxy_session.c:598.  If the
> call to apr_uri_parse() fails, some of the apr_uri_t's fields may be set
> to NULL, and this would cause a segfault in the following lines:
>    authority = puri.hostname;
>    if (!ap_strchr_c(authority, ':') && puri.port
>    ...
> Currently, the URIs are preprocessed by ap_proxy_canon_netloc() much earlier
> than opening the proxy stream, but this may not hold in the future.  As well
> as that, I think that there might be subtle differences between how these two
> functions handle invalid URIs, and that could also result in the crash.
> I attached the patch with a fix for this issue.
> While here, I also spotted an opportunity for a minor code cleanup.  There
> are a couple of places where a function returns an apr_status_t, but the
> calling site tests the result against the OK (hook return code).  I updated
> such places in the second patch.
> Regards,
> Evgeny Kotkov
> <h2-proxy-uri-parse-v1.patch.txt><h2-proxy-apr-status-cleanup-v1.patch.txt>

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