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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-06-29 10:05:45 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-06-29 10:05:45 -0400 |
| commit | 0f17976568b3f72e676450af0c0db6f8752253d6 (patch) | |
| tree | 6bd68d4113163f5205b7ee89a36b162e92b13d20 /kernel/trace/ftrace.c | |
| parent | 32c1431eea4881a6b17bd7c639315010aeefa452 (diff) | |
| download | linux-0f17976568b3f72e676450af0c0db6f8752253d6.tar.bz2 | |
ftrace: Fix regression with module command in stack_trace_filter
When doing the following command:
# echo ":mod:kvm_intel" > /sys/kernel/tracing/stack_trace_filter
it triggered a crash.
This happened with the clean up of probes. It required all callers to the
regex function (doing ftrace filtering) to have ops->private be a pointer to
a trace_array. But for the stack tracer, that is not the case.
Allow for the ops->private to be NULL, and change the function command
callbacks to handle the trace_array pointer being NULL as well.
Fixes: d2afd57a4b96 ("tracing/ftrace: Allow instances to have their own function probes")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 9e5841dc14b5..b308be30dfb9 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -4337,9 +4337,6 @@ static int ftrace_process_regex(struct ftrace_iterator *iter, command = strsep(&next, ":"); - if (WARN_ON_ONCE(!tr)) - return -EINVAL; - mutex_lock(&ftrace_cmd_mutex); list_for_each_entry(p, &ftrace_commands, list) { if (strcmp(p->name, command) == 0) { |