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perf/core: Don't release cred_guard_mutex if not taken

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If we failed to acquire task's cred_guard_mutex we shouldn't proceed
to release it in the error path.

Fixes: a63fbed776 ("perf/tracing/cpuhotplug: Fix locking order")
Signed-off-by: Alexander Levin <alexander.levin@verizon.com>
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: mathieu.desnoyers@efficios.com
Cc: mhiramat@kernel.org
Cc: paulmck@linux.vnet.ibm.com
Cc: bigeasy@linutronix.de
Link: http://lkml.kernel.org/r/20170603033903.12056-1-alexander.levin@verizon.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Alexander Levin 2017-06-03 03:39:13 +00:00 committed by Thomas Gleixner
parent 49dfe2a677
commit e5aeee51f6
1 changed files with 1 additions and 1 deletions
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2
kernel/events/core.c
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@ -9878,7 +9878,7 @@ SYSCALL_DEFINE5(perf_event_open,
if (task) {
err = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
if (err)
goto err_cred;
goto err_task;
/*
* Reuse ptrace permission checks for now.