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| author |   Divya Indi <divya.indi@oracle.com> | 2019-08-14 10:55:24 -0700 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-11-13 09:37:29 -0500 |
| commit | e585e6469d6f476b82aa148dc44aaf7ae269a4e2 (patch) | |
| tree | a165cec89202db3d956b465a055fadfa92c792b7 /kernel/trace | |
| parent | tracing: Declare newly exported APIs in include/linux/trace.h (diff) | |
| download | wireguard-linux-e585e6469d6f476b82aa148dc44aaf7ae269a4e2.tar.xz wireguard-linux-e585e6469d6f476b82aa148dc44aaf7ae269a4e2.zip | |
tracing: Verify if trace array exists before destroying it.
A trace array can be destroyed from userspace or kernel. Verify if the
trace array exists before proceeding to destroy/remove it.
Link: http://lkml.kernel.org/r/1565805327-579-3-git-send-email-divya.indi@oracle.com
Reviewed-by: Aruna Ramakrishna <aruna.ramakrishna@oracle.com>
Signed-off-by: Divya Indi <divya.indi@oracle.com>
[ Removed unneeded braces ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index db7d06a26861..fa4f742fc449 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -8556,17 +8556,26 @@ static int __remove_instance(struct trace_array *tr) return 0; } -int trace_array_destroy(struct trace_array *tr) +int trace_array_destroy(struct trace_array *this_tr) { + struct trace_array *tr; int ret; - if (!tr) + if (!this_tr) return -EINVAL; mutex_lock(&event_mutex); mutex_lock(&trace_types_lock); - ret = __remove_instance(tr); + ret = -ENODEV; + + /* Making sure trace array exists before destroying it. */ + list_for_each_entry(tr, &ftrace_trace_arrays, list) { + if (tr == this_tr) { + ret = __remove_instance(tr); + break; + } + } mutex_unlock(&trace_types_lock); mutex_unlock(&event_mutex); |