4.17-stable review patch. If anyone has any objections, please let me know.
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From: Doron Roberts-Kedes doronrk@fb.com
[ Upstream commit 52ee6ef36ee10dd493cf2067311e56ca8015eb8d ]
The current code does not inspect the return value of skb_to_sgvec. This can cause a nullptr kernel panic when the malformed sgvec is passed into the crypto request.
Checking the return value of skb_to_sgvec and skipping decryption if it is negative fixes this problem.
Fixes: c46234ebb4d1 ("tls: RX path for ktls") Acked-by: Dave Watson davejwatson@fb.com Signed-off-by: Doron Roberts-Kedes doronrk@fb.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/tls/tls_sw.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -705,6 +705,10 @@ static int decrypt_skb(struct sock *sk, nsg = skb_to_sgvec(skb, &sgin[1], rxm->offset + tls_ctx->rx.prepend_size, rxm->full_len - tls_ctx->rx.prepend_size); + if (nsg < 0) { + ret = nsg; + goto out; + }
tls_make_aad(ctx->rx_aad_ciphertext, rxm->full_len - tls_ctx->rx.overhead_size, @@ -716,6 +720,7 @@ static int decrypt_skb(struct sock *sk, rxm->full_len - tls_ctx->rx.overhead_size, skb, sk->sk_allocation);
+out: if (sgin != &sgin_arr[0]) kfree(sgin);