[PATCH 10/12] vhost/crypto: fix build with GCC 12

[David Marchand <david.marchand@redhat.com>]

GCC 12 raises the following warning:

In file included from ../lib/mempool/rte_mempool.h:46,
                 from ../lib/mbuf/rte_mbuf.h:38,
                 from ../lib/vhost/vhost_crypto.c:7:
../lib/vhost/vhost_crypto.c: In function ‘rte_vhost_crypto_fetch_requests’:
../lib/eal/x86/include/rte_memcpy.h:371:9: warning: array subscript 1 is
     outside array bounds of ‘struct virtio_crypto_op_data_req[1]’
     [-Warray-bounds]
  371 | rte_mov32((uint8_t *)dst + 3 * 32, (const uint8_t *)src + 3 * 32);
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/vhost/vhost_crypto.c:1178:42: note: while referencing ‘req’
 1178 |         struct virtio_crypto_op_data_req req;
      |                                          ^~~

Check that copied length is within req boundaries.

Fixes: 3c79609fda7c ("vhost/crypto: handle virtually non-contiguous buffers")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 lib/vhost/vhost_crypto.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/vhost/vhost_crypto.c b/lib/vhost/vhost_crypto.c
index b1c0eb6a0f..83325b7042 100644
--- a/lib/vhost/vhost_crypto.c
+++ b/lib/vhost/vhost_crypto.c
@@ -576,16 +576,16 @@ copy_data(void *dst_data, struct vhost_crypto_data_req *vc_req,
 	uint32_t to_copy;
 	uint8_t *data = dst_data;
 	uint8_t *src;
-	int left = size;
+	uint32_t left = size;
 
-	to_copy = RTE_MIN(desc->len, (uint32_t)left);
+	to_copy = RTE_MIN(desc->len, left);
 	dlen = to_copy;
 	src = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr, &dlen,
 			VHOST_ACCESS_RO);
-	if (unlikely(!src || !dlen))
+	if (unlikely(!src || !dlen || dlen > left))
 		return -1;
 
-	rte_memcpy((uint8_t *)data, src, dlen);
+	rte_memcpy(data, src, dlen);
 	data += dlen;
 
 	if (unlikely(dlen < to_copy)) {
-- 
2.36.1