[PATCH] net/mlx5/core/fpga/ipsec: Fix use-after-free

[Gustavo A. R. Silva]

_rule_ is being freed and then dereferenced by accessing rule->ctx

Fix this by copying the value returned by PTR_ERR(rule->ctx) into a local
variable for its safe use after freeing _rule_

Addresses-Coverity-ID: 1466041 ("Read from pointer after free")
Fixes: 05564d0ae075 ("net/mlx5: Add flow-steering commands for FPGA IPSec 
implementation")
Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c 
b/drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c
index 4f15685..0f5da49 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c
@@ -1061,8 +1061,9 @@ static int fpga_ipsec_fs_create_fte(struct mlx5_core_dev 
*dev,
 
        rule->ctx = mlx5_fpga_ipsec_fs_create_sa_ctx(dev, fte, is_egress);
        if (IS_ERR(rule->ctx)) {
+               int err = PTR_ERR(rule->ctx);
                kfree(rule);
-               return PTR_ERR(rule->ctx);
+               return err;
        }
 
        rule->fte = fte;
-- 
2.7.4