nfp: bpf: Use kmemdup_array instead of kmemdup for multiple allocation

[PATCH v1] nfp: bpf: Use kmemdup_array instead of kmemdup for multiple allocation

Posted by Yu Jiaoliang 1 year, 10 months ago

Let the kememdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>
---
 drivers/net/ethernet/netronome/nfp/bpf/jit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
index df2ab5cbd49b..3a02eef58cc6 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
@@ -4537,8 +4537,8 @@ void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv)
 	u64 *prog;
 	int err;
 
-	prog = kmemdup(nfp_prog->prog, nfp_prog->prog_len * sizeof(u64),
-		       GFP_KERNEL);
+	prog = kmemdup_array(nfp_prog->prog, nfp_prog->prog_len, sizeof(u64),
+			     GFP_KERNEL);
 	if (!prog)
 		return ERR_PTR(-ENOMEM);
 
-- 
2.34.1

Re: [PATCH v1] nfp: bpf: Use kmemdup_array instead of kmemdup for multiple allocation

Posted by Simon Horman 1 year, 10 months ago

On Wed, Aug 21, 2024 at 04:14:45PM +0800, Yu Jiaoliang wrote:
> Let the kememdup_array() take care about multiplication and possible
> overflows.
> 
> Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH v1] nfp: bpf: Use kmemdup_array instead of kmemdup for multiple allocation

Posted by Louis Peens 1 year, 10 months ago

On Wed, Aug 21, 2024 at 04:14:45PM +0800, Yu Jiaoliang wrote:
> [Some people who received this message don't often get email from yujiaoliang@vivo.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> Let the kememdup_array() take care about multiplication and possible
> overflows.
> 
> Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>
> ---
>  drivers/net/ethernet/netronome/nfp/bpf/jit.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
> index df2ab5cbd49b..3a02eef58cc6 100644
> --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c
> +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c
> @@ -4537,8 +4537,8 @@ void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv)
>         u64 *prog;
>         int err;
> 
> -       prog = kmemdup(nfp_prog->prog, nfp_prog->prog_len * sizeof(u64),
> -                      GFP_KERNEL);
> +       prog = kmemdup_array(nfp_prog->prog, nfp_prog->prog_len, sizeof(u64),
> +                            GFP_KERNEL);
>         if (!prog)
>                 return ERR_PTR(-ENOMEM);
> 
> --
Hi, thanks for the cleanup, looks good to me.

Signed-off-by: Louis Peens <louis.peens@corigine.com>