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Re: Code doesn't seem ... right

From: Justin Erenkrantz <justin_at_erenkrantz.com>
Date: Mon, 24 Jan 2011 17:52:25 -0800

On Mon, Jan 24, 2011 at 2:22 PM, C. Michael Pilato <cmpilato_at_collab.net> wrote:
> [Using dev@ as a public TODO list to avoid pushing stack on a task.]
>
> In mod_dav_svn/mirror.c:dav_svn__location_body_filter() and
> dav_svn__location_in_filter() are code blocks like this:
>
>    if (uri.path)
>        canonicalized_uri = svn_urlpath__canonicalize(uri.path, r->pool);
>    else
>        canonicalized_uri = uri.path;
>    if (strcmp(canonicalized_uri, root_dir) == 0) {
>    [...]
>
> So ... if uri.path == NULL, then canonicalized_uri is set to NULL, and then
> that NULL is used in a strcmp().  Won't that SEGFAULT?

It'd be difficult (if not outright impossible) to hit that else case.
Follow apr_uri_parse and apr_pstrmemdup. Also know that we don't hit
this code block if master_uri isn't set. The original code I wrote
was just a straight strcmp - I believe the check for null is spurious.

My $.02. -- justin
Received on 2011-01-25 02:53:05 CET

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