[PATCH 4.17 251/324] ixgbe: Off by one in ixgbe_ipsec_tx()

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

[ Upstream commit c411104115e6821f26fc8f6de8b235ddf98de688 ]

The ipsec->tx_tbl[] has IXGBE_IPSEC_MAX_SA_COUNT elements so the > needs
to be changed to >= so we don't read one element beyond the end of the
array.

Fixes: 592594704761 ("ixgbe: process the Tx ipsec offload")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Shannon Nelson <shannon.nelson@xxxxxxxxxx>
Tested-by: Andrew Bowers <andrewx.bowers@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
@@ -759,7 +759,7 @@ int ixgbe_ipsec_tx(struct ixgbe_ring *tx
 	}
 
 	itd->sa_idx = xs->xso.offload_handle - IXGBE_IPSEC_BASE_TX_INDEX;
-	if (unlikely(itd->sa_idx > IXGBE_IPSEC_MAX_SA_COUNT)) {
+	if (unlikely(itd->sa_idx >= IXGBE_IPSEC_MAX_SA_COUNT)) {
 		netdev_err(tx_ring->netdev, "%s: bad sa_idx=%d handle=%lu\n",
 			   __func__, itd->sa_idx, xs->xso.offload_handle);
 		return 0;