tracing/uprobe: Fix uprobe_perf_open probes iteration

commit 1880ed71ce863318c1ce93bf324876fb5f92854f upstream.

Add missing 'tu' variable initialization in the probes loop,
otherwise the head 'tu' is used instead of added probes.

Link: https://lkml.kernel.org/r/20211123142801.182530-1-jolsa@kernel.org
Cc: stable@vger.kernel.org
Fixes: 99c9a923e97a ("tracing/uprobe: Fix double perf_event linking on multiprobe uprobe")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 0dd6e286e5196236e1f229f3a6c98c3d2b3b899e..9900d4e3808cc1d47370124916627cc51685064c 100644 (file)
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1312,6 +1312,7 @@ static int uprobe_perf_open(struct trace_event_call *call,
                return 0;
 
        list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
+               tu = container_of(pos, struct trace_uprobe, tp);
                err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
                if (err) {
                        uprobe_perf_close(call, event);