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| author |   Li Zefan <lizf@cn.fujitsu.com> | 2009-05-07 15:11:15 +0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-05-07 10:07:28 +0200 |
| commit | d94fc523f3c35bd8013f04827e94756cbc0212f4 (patch) | |
| tree | aacd8c0aaa2024437b7bfba4636afcc87f4890bf | |
| parent | tracing/filters: support for operator reserved characters in strings (diff) | |
| download | linux-dev-d94fc523f3c35bd8013f04827e94756cbc0212f4.tar.xz linux-dev-d94fc523f3c35bd8013f04827e94756cbc0212f4.zip | |
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>
| -rw-r--r-- | kernel/trace/trace_events_filter.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 8c62e5bdff09..85ad6a8939ad 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; } |