From a2713257ee2be22827d7bc248302d408c91bfb95 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Fri, 15 Sep 2023 13:12:38 -0600 Subject: tls: Use size_add() in call to struct_size() If, for any reason, the open-coded arithmetic causes a wraparound, the protection that `struct_size()` adds against potential integer overflows is defeated. Fix this by hardening call to `struct_size()` with `size_add()`. Fixes: b89fec54fd61 ("tls: rx: wrap decrypt params in a struct") Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook Signed-off-by: David S. Miller --- net/tls/tls_sw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index d1fc295b83b5..270712b8d391 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -1487,7 +1487,7 @@ static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov, */ aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv); aead_size = ALIGN(aead_size, __alignof__(*dctx)); - mem = kmalloc(aead_size + struct_size(dctx, sg, n_sgin + n_sgout), + mem = kmalloc(aead_size + struct_size(dctx, sg, size_add(n_sgin, n_sgout)), sk->sk_allocation); if (!mem) { err = -ENOMEM; -- cgit