From: Hangyu Hua hbh25y@gmail.com

[ Upstream commit ce07087964208eee2ca2f9ee4a98f8b5d9027fe6 ]

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@crudebyte.com Signed-off-by: Hangyu Hua hbh25y@gmail.com Message-ID: 20231027030302.11927-1-hbh25y@gmail.com Signed-off-by: Dominique Martinet asmadeus@codewreck.org Signed-off-by: Sasha Levin sashal@kernel.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=218235 Signed-off-by: Alexey Panov apanov@astralinux.ru --- net/9p/client.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/9p/client.c b/net/9p/client.c index e8862cd4f91b..cd85a4b6448b 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -520,11 +520,14 @@ 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;