From: Tadeusz Struk tadeusz.struk@linaro.org
commit 3e6db079751afd527bf3db32314ae938dc571916 upstream.
kmemdup can return a null pointer so need to check for it, otherwise the null key will be dereferenced later in tipc_crypto_key_xmit as can be seen in the trace [1].
Cc: tipc-discussion@lists.sourceforge.net Cc: stable@vger.kernel.org # 5.15, 5.14, 5.10
[1] https://syzkaller.appspot.com/bug?id=bca180abb29567b189efdbdb34cbf7ba851c2a5...
Reported-by: Dmitry Vyukov dvyukov@google.com Signed-off-by: Tadeusz Struk tadeusz.struk@linaro.org Acked-by: Ying Xue ying.xue@windriver.com Acked-by: Jon Maloy jmaloy@redhat.com Link: https://lore.kernel.org/r/20211115160143.5099-1-tadeusz.struk@linaro.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/tipc/crypto.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/net/tipc/crypto.c +++ b/net/tipc/crypto.c @@ -597,6 +597,10 @@ static int tipc_aead_init(struct tipc_ae tmp->cloned = NULL; tmp->authsize = TIPC_AES_GCM_TAG_SIZE; tmp->key = kmemdup(ukey, tipc_aead_key_size(ukey), GFP_KERNEL); + if (!tmp->key) { + tipc_aead_free(&tmp->rcu); + return -ENOMEM; + } memcpy(&tmp->salt, ukey->key + keylen, TIPC_AES_GCM_SALT_SIZE); atomic_set(&tmp->users, 0); atomic64_set(&tmp->seqno, 0);