From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Ido Schimmel <idosch@nvidia.com>, Petr Machata <petrm@nvidia.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-hardening@vger.kernel.org
Subject: [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc()
Date: Tue, 25 Jan 2022 11:01:28 -0600 [thread overview]
Message-ID: <20220125170128.GA60918@embeddedor> (raw)
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
next reply other threads:[~2022-01-25 16:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-25 17:01 Gustavo A. R. Silva [this message]
2022-01-26 7:54 ` [PATCH][next] mlxsw: spectrum_kvdl: Use struct_size() helper in kzalloc() Ido Schimmel
2022-01-26 10:55 ` Petr Machata
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