perf/core: Fix perf_uprobe_init()

Similarly to the uprobe PMU fix in perf_kprobe_init(), fix error
handling in perf_uprobe_init() as well.

Reported-by: 范龙飞 <long7573@126.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: e12f03d7031a ("perf/core: Implement the 'perf_kprobe' PMU")
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 94600f1f7efac5ab9787711e198023a08f7bf020..c79193e598f54fe928d331588d7169c6e0154de1 100644 (file)
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -302,6 +302,8 @@ int perf_uprobe_init(struct perf_event *p_event, bool is_retprobe)
                return -ENOMEM;
        ret = strncpy_from_user(
                path, u64_to_user_ptr(p_event->attr.uprobe_path), PATH_MAX);
+       if (ret == PATH_MAX)
+               return -E2BIG;
        if (ret < 0)
                goto out;
        if (path[0] == '\0') {