Messages in this thread Patch in this message | | | Date | Fri, 15 Mar 2019 14:45:13 -0400 | From | Steven Rostedt <> | Subject | [PATCH 8/8] tracing/probe: Verify alloc_trace_*probe() result |
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From: Masami Hiramatsu <mhiramat@kernel.org>
Since alloc_trace_*probe() returns -EINVAL only if !event && !group, it should not happen in trace_*probe_create(). If we catch that case there is a bug. So use WARN_ON_ONCE() instead of pr_info().
Link: http://lkml.kernel.org/r/155253785078.14922.16902223633734601469.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- kernel/trace/trace_kprobe.c | 4 ++-- kernel/trace/trace_uprobe.c | 3 ++- 2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 5265117ad7e8..63aa0ab56051 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -693,9 +693,9 @@ static int trace_kprobe_create(int argc, const char *argv[]) tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive, argc, is_return); if (IS_ERR(tk)) { - pr_info("Failed to allocate trace_probe.(%d)\n", - (int)PTR_ERR(tk)); ret = PTR_ERR(tk); + /* This must return -ENOMEM otherwise there is a bug */ + WARN_ON_ONCE(ret != -ENOMEM); goto out; } diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 52f033489377..b54137ec7810 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -514,8 +514,9 @@ static int trace_uprobe_create(int argc, const char **argv) tu = alloc_trace_uprobe(group, event, argc, is_return); if (IS_ERR(tu)) { - pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu)); ret = PTR_ERR(tu); + /* This must return -ENOMEM otherwise there is a bug */ + WARN_ON_ONCE(ret != -ENOMEM); goto fail_address_parse; } tu->offset = offset; -- 2.20.1
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