Re: [PATCH 15/28] http: call git_inflate_end() when releasing http_object_request

[Patrick Steinhardt <ps@pks.im>]

On Tue, Sep 24, 2024 at 06:02:13PM -0400, Jeff King wrote:
> In new_http_object_request(), we initialize the zlib stream with
> git_inflate_init(). We must have a matching git_inflate_end() to avoid
> leaking any memory allocated by zlib.
> 
> In most cases this happens in finish_http_object_request(), but we don't
> always get there. If we abort a request mid-stream, then we may clean it
> up without hitting that function.
> 
> We can't just add a git_inflate_end() call to the release function,
> though. That would double-free the cases that did actually finish.
> Instead, we'll move the call from the finish function to the release
> function. This does delay it for the cases that do finish, but I don't
> think it matters. We should have already reached Z_STREAM_END (and
> complain if we didn't), and we do not record any status code from
> git_inflate_end().

I had to read this paragraph multiple times to understand it, as I
wondered why you did end up adding it to `release_http_object_request()`
even though the paragraph claims that you cannot. But what you say is
that you must _move_ the call, not add it, and that's what the patch
does.

So yeah, that does make sense.

Patrick