From d1de10870909a27ce2ac380d0671feb308826491 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Wed, 23 May 2012 11:36:49 +0900 Subject: [PATCH] tools lib traceevent: Fix a possibly wrong memory dereference If set_op_prio() failed, the token will be freed at out_free, then arg->op.op would turn out to be a dangle pointer. After returning EVENT_ERROR from process_op(), free_arg() will be called and then it will finally see the dangling pointer. Cc: Borislav Petkov Cc: David Ahern Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1337740619-27925-13-git-send-email-namhyung.kim@lge.com Signed-off-by: Namhyung Kim Signed-off-by: Steven Rostedt Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/traceevent/event-parse.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index d598b376e3c1..445a43ad42fd 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -1715,6 +1715,8 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok) if (set_op_prio(arg) == -1) { event->flags |= EVENT_FL_FAILED; + /* arg->op.op (= token) will be freed at out_free */ + arg->op.op = NULL; goto out_free; } -- 2.20.1