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tracing/probe: Check maxactive error cases

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Check maxactive on kprobe error case, because maxactive
is only for kretprobe, not for kprobe. Also, maxactive
should not be 0, it should be at least 1.

Link: http://lkml.kernel.org/r/155253780952.14922.15784129810238750331.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2019-03-14 13:30:09 +09:00 committed by Steven Rostedt (VMware)
parent 31b265b3ba
commit 287c038c0b
1 changed files with 7 additions and 3 deletions
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10
kernel/trace/trace_kprobe.c
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@ -624,7 +624,11 @@ static int trace_kprobe_create(int argc, const char *argv[])
if (event)
event++;
if (is_return && isdigit(argv[0][1])) {
if (isdigit(argv[0][1])) {
if (!is_return) {
pr_info("Maxactive is not for kprobe");
return -EINVAL;
}
if (event)
len = event - &argv[0][1] - 1;
else
@ -634,8 +638,8 @@ static int trace_kprobe_create(int argc, const char *argv[])
memcpy(buf, &argv[0][1], len);
buf[len] = '\0';
ret = kstrtouint(buf, 0, &maxactive);
if (ret) {
pr_info("Failed to parse maxactive.\n");
if (ret || !maxactive) {
pr_info("Invalid maxactive number\n");
return ret;
}
/* kretprobes instances are iterated over via a list. The