_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 <[email protected]>
---
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
On Thu, Mar 22, 2018 at 01:03:42PM -0500, Gustavo A. R. Silva wrote:
> _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 <[email protected]>
Prefix should not be that long, a short one as this is enough.
net/mlx5: Fix use-after-free
Besides that - lgtm.
Reviewed-by: Yuval Shaia <[email protected]>
> ---
> 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
>
> --
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Hi Yuval,
On 03/22/2018 01:32 PM, Yuval Shaia wrote:
> On Thu, Mar 22, 2018 at 01:03:42PM -0500, Gustavo A. R. Silva wrote:
>> _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 <[email protected]>
>
> Prefix should not be that long, a short one as this is enough.
>
Yeah. Actually, I was suspicious about it.
> net/mlx5: Fix use-after-free
>
> Besides that - lgtm.
>
> Reviewed-by: Yuval Shaia <[email protected]>
>
I'll send v2 with a short prefix and add your Reviewed-by.
Thanks for the feedback.
--
Gustavo