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38600eb4fc
The array of sasl_callback_t callbacks which is passed to sasl_client_new() must be kept alive as long as the created sasl_conn_t object is alive as cyrus-sasl uses this structure internally for things like logging, so the memory used for callbacks must only be freed after sasl_dispose() has been called. During testing of successful SASL logins with virsh -c qemu+tls:///system list --all I've been getting invalid read reports from valgrind ==9237== Invalid read of size 8 ==9237== at 0x6E93B6F: _sasl_getcallback (common.c:1745) ==9237== by 0x6E95430: _sasl_log (common.c:1850) ==9237== by 0x16593D87: digestmd5_client_mech_dispose (digestmd5.c:4580) ==9237== by 0x6E91653: client_dispose (client.c:332) ==9237== by 0x6E9476A: sasl_dispose (common.c:851) ==9237== by 0x4E225A1: virNetSASLSessionDispose (virnetsaslcontext.c:678) ==9237== by 0x4CBC551: virObjectUnref (virobject.c:262) ==9237== by 0x4E254D1: virNetSocketDispose (virnetsocket.c:1042) ==9237== by 0x4CBC551: virObjectUnref (virobject.c:262) ==9237== by 0x4E2701C: virNetSocketEventFree (virnetsocket.c:1794) ==9237== by 0x4C965D3: virEventPollCleanupHandles (vireventpoll.c:583) ==9237== by 0x4C96987: virEventPollRunOnce (vireventpoll.c:652) ==9237== by 0x4C94730: virEventRunDefaultImpl (virevent.c:274) ==9237== by 0x12C7BA: vshEventLoop (virsh.c:2407) ==9237== by 0x4CD3D04: virThreadHelper (virthreadpthread.c:161) ==9237== by 0x7DAEF32: start_thread (pthread_create.c:309) ==9237== by 0x8C86EAC: clone (clone.S:111) ==9237== Address 0xe2d61b0 is 0 bytes inside a block of size 168 free'd ==9237== at 0x4A07577: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==9237== by 0x4C73827: virFree (viralloc.c:580) ==9237== by 0x4DE4BC7: remoteAuthSASL (remote_driver.c:4219) ==9237== by 0x4DE33D0: remoteAuthenticate (remote_driver.c:3639) ==9237== by 0x4DDBFAA: doRemoteOpen (remote_driver.c:832) ==9237== by 0x4DDC8DC: remoteConnectOpen (remote_driver.c:1031) ==9237== by 0x4D8595F: do_open (libvirt.c:1239) ==9237== by 0x4D863F3: virConnectOpenAuth (libvirt.c:1481) ==9237== by 0x12762B: vshReconnect (virsh.c:337) ==9237== by 0x12C9B0: vshInit (virsh.c:2470) ==9237== by 0x12E9A5: main (virsh.c:3338) This commit changes virNetSASLSessionNewClient() to take ownership of the SASL callbacks. Then we can free them in virNetSASLSessionDispose() after the corresponding sasl_conn_t has been freed. (cherry picked from commit 13fdc6d63ef64f8e231a087e1dab7d90145c3c10)
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>