* [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc()
@ 2022-01-25 17:01 Gustavo A. R. Silva
2022-01-26 7:54 ` Ido Schimmel
2022-01-26 10:55 ` Petr Machata
0 siblings, 2 replies; 3+ messages in thread
From: Gustavo A. R. Silva @ 2022-01-25 17:01 UTC (permalink / raw)
To: Ido Schimmel, Petr Machata, David S. Miller, Jakub Kicinski
Cc: netdev, linux-kernel, Gustavo A. R. Silva, linux-hardening
Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.
Also, address the following sparse warnings:
drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c:229:24: warning: using sizeof on a flexible structure
Link: https://github.com/KSPP/linux/issues/174
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c
index a9fff8adc75e..d20e794e01ca 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c
@@ -213,7 +213,6 @@ mlxsw_sp1_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp1_kvdl_part *part;
bool need_update = true;
unsigned int nr_entries;
- size_t usage_size;
u64 resource_size;
int err;
@@ -225,8 +224,8 @@ mlxsw_sp1_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
}
nr_entries = div_u64(resource_size, info->alloc_size);
- usage_size = BITS_TO_LONGS(nr_entries) * sizeof(unsigned long);
- part = kzalloc(sizeof(*part) + usage_size, GFP_KERNEL);
+ part = kzalloc(struct_size(part, usage, BITS_TO_LONGS(nr_entries)),
+ GFP_KERNEL);
if (!part)
return ERR_PTR(-ENOMEM);
--
2.27.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc()
2022-01-25 17:01 [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc() Gustavo A. R. Silva
@ 2022-01-26 7:54 ` Ido Schimmel
2022-01-26 10:55 ` Petr Machata
1 sibling, 0 replies; 3+ messages in thread
From: Ido Schimmel @ 2022-01-26 7:54 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Ido Schimmel, Petr Machata, David S. Miller, Jakub Kicinski,
netdev, linux-kernel, linux-hardening
On Tue, Jan 25, 2022 at 11:01:28AM -0600, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worst scenario, could lead to heap overflows.
>
> Also, address the following sparse warnings:
> drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c:229:24: warning: using sizeof on a flexible structure
>
> Link: https://github.com/KSPP/linux/issues/174
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Thanks
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc()
2022-01-25 17:01 [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc() Gustavo A. R. Silva
2022-01-26 7:54 ` Ido Schimmel
@ 2022-01-26 10:55 ` Petr Machata
1 sibling, 0 replies; 3+ messages in thread
From: Petr Machata @ 2022-01-26 10:55 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Ido Schimmel, Petr Machata, David S. Miller, Jakub Kicinski,
netdev, linux-kernel, linux-hardening
"Gustavo A. R. Silva" <gustavoars@kernel.org> writes:
> Make use of the struct_size() helper instead of an open-coded version,
> in order to avoid any potential type mistakes or integer overflows that,
> in the worst scenario, could lead to heap overflows.
>
> Also, address the following sparse warnings:
> drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c:229:24: warning: using sizeof on a flexible structure
>
> Link: https://github.com/KSPP/linux/issues/174
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c
> index a9fff8adc75e..d20e794e01ca 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum1_kvdl.c
> @@ -213,7 +213,6 @@ mlxsw_sp1_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
> struct mlxsw_sp1_kvdl_part *part;
> bool need_update = true;
> unsigned int nr_entries;
> - size_t usage_size;
> u64 resource_size;
> int err;
>
> @@ -225,8 +224,8 @@ mlxsw_sp1_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
> }
>
> nr_entries = div_u64(resource_size, info->alloc_size);
> - usage_size = BITS_TO_LONGS(nr_entries) * sizeof(unsigned long);
> - part = kzalloc(sizeof(*part) + usage_size, GFP_KERNEL);
> + part = kzalloc(struct_size(part, usage, BITS_TO_LONGS(nr_entries)),
> + GFP_KERNEL);
> if (!part)
> return ERR_PTR(-ENOMEM);
Reviewed-by: Petr Machata <petrm@nvidia.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-01-26 10:55 ` Petr Machata
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