linux-kernel - [PATCH v2] tracing: check the return value of kstrdup()

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Message-ID: <tencent_3C2E330722056D7891D2C83F29C802734B06@qq.com>
Date:   Tue, 14 Dec 2021 09:28:02 +0800
From:   xkernel.wang@...mail.com
To:     rostedt@...dmis.org, mingo@...hat.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v2] tracing: check the return value of kstrdup()

From: Xiaoke Wang <xkernel.wang@...mail.com>

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.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
Changelogs:
Compare with the last email, this one is using my full name.
And I am sorry that I did not notice the bugs in trace_boot.c had been
already patched. So I removed the content about trace_boot.c.
---
 kernel/trace/trace_uprobe.c | 5 +++++
 1 files changed, 5 insertions(+)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 225ce56..173ff0f 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1618,6 +1618,11 @@ create_local_trace_uprobe(char *name, unsigned long offs,
 	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);
 
 	ptype = is_ret_probe(tu) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;
--