6.5-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 ce925f3a52492..57e4601eaaf50 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1488,7 +1488,7 @@ 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
