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selinux: fix bad cleanup on error in hashtab_duplicate()

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commit 6254bd3db316c9ccb3b05caa8b438be63245466f upstream.

The code attempts to free the 'new' pointer using kmem_cache_free(),
which is wrong because this function isn't responsible of freeing it.
Instead, the function should free new->htable and clear the contents of
*new (to prevent double-free).

Cc: stable@vger.kernel.org
Fixes: c7c556f1e8 ("selinux: refactor changing booleans")
Reported-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ondrej Mosnacek 2022-05-17 14:08:16 +02:00 committed by Greg Kroah-Hartman
parent 3ee8e109c3
commit b42e5e3a84
1 changed files with 2 additions and 1 deletions
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3
security/selinux/ss/hashtab.c
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@ -178,7 +178,8 @@ int hashtab_duplicate(struct hashtab *new, struct hashtab *orig,
kmem_cache_free(hashtab_node_cachep, cur);
}
}
kmem_cache_free(hashtab_node_cachep, new);
kfree(new->htable);
memset(new, 0, sizeof(*new));
return -ENOMEM;
}