crypto/virtio: fix out-of-bounds access

[ upstream commit a965e768065ae496c9a1c7a77545bc0f0f0e38e2 ]

Coverity flags an untrusted loop bound. Check length of session iv.

Coverity issue: 375802
Fixes: b063e84 ("crypto/virtio: fix IV physical address")

Signed-off-by: Brian Dooley <brian.dooley@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>

drivers/crypto/virtio/virtio_rxtx.c

@@ -264,6 +264,9 @@ virtqueue_crypto_sym_enqueue_xmit(
 		if (cop->phys_addr)
 			desc[idx].addr = cop->phys_addr + session->iv.offset;
 		else {
+			if (session->iv.length > VIRTIO_CRYPTO_MAX_IV_SIZE)
+				return -ENOMEM;
+
 			rte_memcpy(crypto_op_cookie->iv,
 					rte_crypto_op_ctod_offset(cop,
 					uint8_t *, session->iv.offset),