tracing/kprobes: Reject new event if loc is NULL
Reject the new event which has NULL location for kprobes.
For kprobes, user must specify at least the location.
Link: http://lkml.kernel.org/r/158779376597.6082.1411212055469099461.stgit@devnote2
Cc: Tom Zanussi <zanussi@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 2a588dd1d5
("tracing: Add kprobe event command generation functions")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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parent
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@ -940,6 +940,9 @@ EXPORT_SYMBOL_GPL(kprobe_event_cmd_init);
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* complete command or only the first part of it; in the latter case,
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* kprobe_event_add_fields() can be used to add more fields following this.
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*
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* Unlikely the synth_event_gen_cmd_start(), @loc must be specified. This
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* returns -EINVAL if @loc == NULL.
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*
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* Return: 0 if successful, error otherwise.
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*/
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int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
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@ -953,6 +956,9 @@ int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd, bool kretprobe,
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if (cmd->type != DYNEVENT_TYPE_KPROBE)
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return -EINVAL;
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if (!loc)
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return -EINVAL;
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if (kretprobe)
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snprintf(buf, MAX_EVENT_NAME_LEN, "r:kprobes/%s", name);
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else
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