[PATCH 6.1 036/379] tls: Use size_add() in call to struct_size()

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

[ Upstream commit a2713257ee2be22827d7bc248302d408c91bfb95 ]

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 <gustavoars@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 62d25f355d2c0..2e60bf06adff0 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1512,7 +1512,7 @@ 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;
-- 
2.42.0






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