5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Hangyu Hua <hbh25y@xxxxxxxxx>
commit ce07087964208eee2ca2f9ee4a98f8b5d9027fe6 upstream.
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@xxxxxxxxxxxxx>
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Message-ID: <20231027030302.11927-1-hbh25y@xxxxxxxxx>
Signed-off-by: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218235
Signed-off-by: Alexey Panov <apanov@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/9p/client.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -520,11 +520,14 @@ static int p9_check_errors(struct p9_cli
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;
