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HTTP-FLV: Crash when multiple viewers. v6.0.148 (#4144)

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I did some preliminary code inspection. The two playback endpoints share
the same `SrsLiveStream` instance. After the first one disconnects,
`alive_` is set to false.
```
  alive_ = true;
  err = do_serve_http(w, r);
  alive_ = false;
```

In the `SrsHttpStreamServer::http_unmount(SrsRequest* r)` function,
`stream->alive()` is already false, so `mux.unhandle` will free the
`SrsLiveStream`. This causes the other connection coroutine to return to
its execution environment after the `SrsLiveStream` instance has already
been freed.
```
    // Wait for cache and stream to stop.
    int i = 0;
    for (; i < 1024; i++) {
        if (!cache->alive() && !stream->alive()) {
            break;
        }
        srs_usleep(100 * SRS_UTIME_MILLISECONDS);
    }

    // Unmount the HTTP handler, which will free the entry. Note that we must free it after cache and
    // stream stopped for it uses it.
    mux.unhandle(entry->mount, stream.get());
```

`alive_` was changed from a `bool` to an `int` to ensure that
`mux.unhandle` is only executed after each connection's `serve_http` has
exited.

---------

Co-authored-by: liumengte <liumengte@visionular.com>
Co-authored-by: winlin <winlinvip@gmail.com>
This commit is contained in:
Bahamut 2024-08-15 12:00:42 +08:00 • committed by winlin
parent 133a39a81d
commit 3917422a07
6 changed files with 22 additions and 15 deletions
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5
trunk/src/app/srs_app_http_stream.hpp
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@ -182,7 +182,10 @@ private:
SrsRequest* req;
SrsBufferCache* cache;
SrsSecurity* security_;
bool alive_;
// For multiple viewers, which means there will more than one alive viewers for a live stream, so we must
// use an int value to represent if there is any viewer is alive. We should never do cleanup unless all
// viewers closed the connection.
int alive_viewers_;
public:
SrsLiveStream(SrsRequest* r, SrsBufferCache* c);
virtual ~SrsLiveStream();