[PATCH] vhost/crypto: fix descriptor processing

[David Marchand]

copy_data was returning a pointer to an increased (off by one) descriptor.
Subsequent calls to copy_data in the library were then failing.
Fix this by incrementing the descriptor only if there is some left data
to copy.

Fixes: 7287660a21e0 ("vhost/crypto: fix build with GCC 12")

Reported-by: Jakub Poczatek <jakub.poczatek at intel.com>
Signed-off-by: David Marchand <david.marchand at redhat.com>
---
 lib/vhost/vhost_crypto.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/vhost/vhost_crypto.c b/lib/vhost/vhost_crypto.c
index 96ffb82a5d..54946f46d9 100644
--- a/lib/vhost/vhost_crypto.c
+++ b/lib/vhost/vhost_crypto.c
@@ -610,8 +610,7 @@ copy_data(void *data, struct vhost_crypto_data_req *vc_req,
 			return -1;
 		left -= copied;
 		data = RTE_PTR_ADD(data, copied);
-		desc++;
-	} while (desc < head + max_n_descs && left != 0);
+	} while (left != 0 && ++desc < head + max_n_descs);
 
 	if (unlikely(left != 0))
 		return -1;
-- 
2.36.1