[PATCH 3.16 085/305] net/mlx4_core: Fix access to uninitialized index

Ben Hutchings
2016-08-14T10:59:22Z

From: Tariq Toukan <tariqt@mellanox.com>

commit 2bb07e155bb3e0c722c806723f737cf8020961ef upstream.

Prevent using uninitialized or negative index when handling
steering entries.

Fixes: b12d93d63c32 ('mlx4: Add support for promiscuous mode in the new steering model.')
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/net/ethernet/mellanox/mlx4/mcg.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx4/mcg.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mcg.c
@@ -953,7 +953,7 @@ int mlx4_qp_attach_common(struct mlx4_de
struct mlx4_cmd_mailbox *mailbox;
struct mlx4_mgm *mgm;
u32 members_count;
- int index, prev;
+ int index = -1, prev;
int link = 0;
int i;
int err;
@@ -1032,7 +1032,7 @@ int mlx4_qp_attach_common(struct mlx4_de
goto out;

out:
- if (prot == MLX4_PROT_ETH) {
+ if (prot == MLX4_PROT_ETH && index != -1) {
/* manage the steering entry for promisc mode */
if (new_entry)
new_steering_entry(dev, port, steer, index, qp->qpn);