From: Xiaoke Wang <xkernel.wang@foxmail.com>
Date: Tue, 14 Dec 2021 09:28:02 +0800
Subject: tracing/uprobes: Check the return value of kstrdup() for tu->filename
Git-commit: 8c7224245557707c613f130431cafbaaa4889615
Patch-mainline: v5.16 or v5.16-rc9 (next release)
References: git-fixes

kstrdup() returns NULL when some internal memory errors happen, it is
better to check the return value of it so to catch the memory error in
time.

Link: https://lkml.kernel.org/r/tencent_3C2E330722056D7891D2C83F29C802734B06@qq.com

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: 33ea4b24277b ("perf/core: Implement the 'perf_uprobe' PMU")
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
---
 kernel/trace/trace_uprobe.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1389,6 +1389,11 @@ create_local_trace_uprobe(char *name, un
 	tu->path = path;
 	tu->ref_ctr_offset = ref_ctr_offset;
 	tu->filename = kstrdup(name, GFP_KERNEL);
+	if (!tu->filename) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
 	init_trace_event_call(tu);
 
 	if (traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0) {