From: Masami Hiramatsu <[email protected]> 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 <[email protected]> Signed-off-by: Steven Rostedt (VMware) <[email protected]> --- kernel/trace/trace_kprobe.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index ceafa0a2b1d1..a14837545295 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -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 -- 2.20.1
