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authorLi Zefan <lizf@cn.fujitsu.com>2009-05-07 15:11:15 +0800
committerIngo Molnar <mingo@elte.hu>2009-05-07 10:07:28 +0200
commitd94fc523f3c35bd8013f04827e94756cbc0212f4 (patch)
treeaacd8c0aaa2024437b7bfba4636afcc87f4890bf /kernel/trace
parent5928c3cc0ffcb6894bbab6be591b7ae1786b2d87 (diff)
tracing/events: fix concurrent access to ftrace_events list, fix
In filter_add_subsystem_pred() we should release event_mutex before calling filter_free_subsystem_preds(), since both functions hold event_mutex. [ Impact: fix deadlock when writing invalid pred into subsystem filter ] Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: tzanussi@gmail.com Cc: a.p.zijlstra@chello.nl Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org LKML-Reference: <4A028993.7020509@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_events_filter.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 8c62e5bdff0..85ad6a8939a 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -636,14 +636,15 @@ static int filter_add_subsystem_pred(struct filter_parse_state *ps,
err = filter_add_pred(ps, call, pred);
if (err) {
+ mutex_unlock(&event_mutex);
filter_free_subsystem_preds(system);
parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
- break;
+ goto out;
}
replace_filter_string(call->filter, filter_string);
}
mutex_unlock(&event_mutex);
-
+out:
return err;
}