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apparmor: fix a memleak in multi_transaction_new()

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[ Upstream commit c73275cf68 ]

In multi_transaction_new(), the variable t is not freed or passed out
on the failure of copy_from_user(t->data, buf, size), which could lead
to a memleak.

Fix this bug by adding a put_multi_transaction(t) in the error path.

Fixes: 1dea3b41e8 ("apparmor: speed up transactional queries")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gaosheng Cui 2022-08-23 09:15:03 +08:00 • committed by Greg Kroah-Hartman
commit 935d86b290
1 changed files with 3 additions and 1 deletions
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4
security/apparmor/apparmorfs.c
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@ -867,8 +867,10 @@ static struct multi_transaction *multi_transaction_new(struct file *file,
if (!t)
return ERR_PTR(-ENOMEM);
kref_init(&t->count);
if (copy_from_user(t->data, buf, size))
if (copy_from_user(t->data, buf, size)) {
put_multi_transaction(t);
return ERR_PTR(-EFAULT);
}
return t;
}