[libvirt] [PATCH v2] Fix libvirtd crash possibility

When generating RPC protocol messages, it's strictly needed to have continuousline of numbers or RPC messages. However in case anyone tries backporting some functionality and will skip a number, there is a possibility to make the daemon segfault with newer virsh (version of the library, rpc call, etc.) even unintentionally. The problem is that the skipped numbers will get func filled with NULLs, but there is no check whether these are set before the daemon tries to run them. This patch very simply enhances one check and fixes that. --- src/rpc/virnetserverprogram.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/src/rpc/virnetserverprogram.c b/src/rpc/virnetserverprogram.c index d13b621..95a6d76 100644 --- a/src/rpc/virnetserverprogram.c +++ b/src/rpc/virnetserverprogram.c @@ -1,7 +1,7 @@ /* * virnetserverprogram.c: generic network RPC server program * - * Copyright (C) 2006-2011 Red Hat, Inc. + * Copyright (C) 2006-2012 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -109,12 +109,19 @@ int virNetServerProgramMatches(virNetServerProgramPtr prog, static virNetServerProgramProcPtr virNetServerProgramGetProc(virNetServerProgramPtr prog, int procedure) { + virNetServerProgramProcPtr proc; + if (procedure < 0) return NULL; if (procedure >= prog->nprocs) return NULL; - return &prog->procs[procedure]; + proc = &prog->procs[procedure]; + + if (!proc->func) + return NULL; + + return proc; } unsigned int -- 1.7.12