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tls: Use size_add() in call to struct_size()

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[ Upstream commit a2713257ee ]

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: b89fec54fd ("tls: rx: wrap decrypt params in a struct")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2023-09-15 13:12:38 -06:00 committed by Greg Kroah-Hartman
parent be25fc451e
commit 4c7f066b7b
1 changed files with 1 additions and 1 deletions
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2
net/tls/tls_sw.c
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@ -1491,7 +1491,7 @@ 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;