netdev - [PATCH v2] net: 9p: fix possible memory leak in p9_check

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Message-Id: <20231027030302.11927-1-hbh25y@gmail.com>
Date: Fri, 27 Oct 2023 11:03:02 +0800
From: Hangyu Hua <hbh25y@...il.com>
To: ericvh@...nel.org,
	lucho@...kov.net,
	asmadeus@...ewreck.org,
	linux_oss@...debyte.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: v9fs@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH v2] net: 9p: fix possible memory leak in p9_check_errors()

When p9pdu_readf() is called with "s?d" attribute, it allocates a pointer
that will store a string. But when p9pdu_readf() fails while handling "d"
then this pointer will not be freed in p9_check_errors().

Fixes: 51a87c552dfd ("9p: rework client code to use new protocol support functions")
Reviewed-by: Christian Schoenebeck <linux_oss@...debyte.com>
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
	
	v2: change the Fixes tag and remove "ename != NULL"

 net/9p/client.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/9p/client.c b/net/9p/client.c
index 86bbc7147fc1..b0e7cb7e1a54 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -540,12 +540,14 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 		return 0;
 
 	if (!p9_is_proto_dotl(c)) {
-		char *ename;
+		char *ename = NULL;
 
 		err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
 				  &ename, &ecode);
-		if (err)
+		if (err) {
+			kfree(ename);
 			goto out_err;
+		}
 
 		if (p9_is_proto_dotu(c) && ecode < 512)
 			err = -ecode;
-- 
2.34.1