linux-kernel - [PATCH] fix a potential memleak in rethook

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Date:   Thu, 10 Nov 2022 18:44:38 +0800
From:   Yi Yang <yiyang13@...wei.com>
To:     <rostedt@...dmis.org>, <mhiramat@...nel.org>, <ast@...nel.org>,
        <yiyang13@...wei.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH] fix a potential memleak in rethook_alloc()

In rethook_alloc(), the variable rh is not freed or passed out
if handler is NULL, which could lead to a memleak, fix it.

Fixes: 54ecbe6f1ed5 ("rethook: Add a generic return hook")
Signed-off-by: Yi Yang <yiyang13@...wei.com>
---
 kernel/trace/rethook.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/rethook.c b/kernel/trace/rethook.c
index 01df98db2fbe..f50aebc7698e 100644
--- a/kernel/trace/rethook.c
+++ b/kernel/trace/rethook.c
@@ -91,8 +91,10 @@ struct rethook *rethook_alloc(void *data, rethook_handler_t handler, gfp_t gfp,
 {
 	struct rethook *rh = kzalloc(sizeof(struct rethook), GFP_KERNEL);
 
-	if (!rh || !handler)
+	if (!rh || !handler) {
+		kfree(rh);
 		return NULL;
+	}
 
 	rh->data = data;
 	rh->handler = handler;
-- 
2.17.1