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https://github.com/xmms2/xmms2-devel/pull/5
From 82741bf3094c8e0bca8eb1b7f3bc147eeb51ea06 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyfox@gentoo.org>
Date: Thu, 6 Dec 2018 07:19:08 +0000
Subject: [PATCH] OTHER: fix c++ client dangling reference
On #xmm2 Chewi reported c++/tut7 to be broken at start:
```
GLib-WARNING **: glib-2.56.2/glib/giounix.c:410
Error while getting flags for FD: Bad file descriptor (9)
```
valgrind shows the problem as read of uninitialized data:
```
$ valgrind ./tut7
==32268== Conditional jump or move depends on uninitialised value(s)
==32268== at 0x49DC36B: xmmsc_mainloop_gmain_init (xmmsclient-glib.c:80)
==32268== by 0x49E11BE: Xmms::GMainloop::GMainloop(xmmsc_connection_St*) (xmmsclient++-glib.cpp:11)
==32268== by 0x10C64D: main (in /home/slyfox/dev/git/xmms2-devel/doc/tutorial/c++/tut7)
==32268== Uninitialised value was created by a stack allocation
==32268== at 0x49E119A: Xmms::GMainloop::GMainloop(xmmsc_connection_St*) (xmmsclient++-glib.cpp:8)
```
This happens due to use of dangling C++ reference to stack variable:
```
// somewhere in src/include/xmmsclient/xmmsclient++/mainloop.h
class MainloopInterface {
MainloopInterface( xmmsc_connection_t* conn ) :
running_( false ), conn_( conn ) { }
protected:
bool running_;
xmmsc_connection_t*& conn_;
}
```
Note: `conn_` refers to dangling local variable of
`MainloopInterface::MainloopInterface` constructor.
The fix is to pass through pointer reference.
`MainLoop::MainLoop()` already does it.
Reported-by: James Le Cuirot
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
---
src/include/xmmsclient/xmmsclient++/mainloop.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/include/xmmsclient/xmmsclient++/mainloop.h b/src/include/xmmsclient/xmmsclient++/mainloop.h
index de97e20d..268ca6f7 100644
--- a/src/include/xmmsclient/xmmsclient++/mainloop.h
+++ b/src/include/xmmsclient/xmmsclient++/mainloop.h
@@ -41,7 +41,7 @@ namespace Xmms
* @note The constructor should only initialize the
* mainloop, not start it!
*/
- MainloopInterface( xmmsc_connection_t* conn ) :
+ MainloopInterface( xmmsc_connection_t*& conn ) :
running_( false ), conn_( conn ) { }
/** Destructor. Should also stop the loop.
--
2.19.2
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