From: Xiaoke Wang <xkernel.wang@foxmail.com>
Date: Tue, 14 Dec 2021 10:26:46 +0800
Subject: tracing/probes: check the return value of kstrndup() for pbuf
Git-commit: 1c1857d400355e96f0fe8b32adc6fa7594d03b52
Patch-mainline: v5.16 or v5.16-rc9 (next release)
References: git-fixes
kstrndup() is a memory allocation-related function, it 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_4D6E270731456EB88712ED7F13883C334906@qq.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: a42e3c4de964 ("tracing/probe: Add immediate string parameter support")
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_probe.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 8a3822818bf8..73d90179b51b 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -356,6 +356,8 @@ static int __parse_imm_string(char *str, char **pbuf, int offs)
return -EINVAL;
}
*pbuf = kstrndup(str, len - 1, GFP_KERNEL);
+ if (!*pbuf)
+ return -ENOMEM;
return 0;
}