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9p/net: fix possible memory leak in p9_check_errors()

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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@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hangyu Hua 2023-10-27 11:03:02 +08:00 • committed by Ksawlii
parent 9ff164b71b
commit b50db15c57
1 changed files with 5 additions and 2 deletions
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7
net/9p/client.c
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@ -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;