* [PATCH v2] [net] net: airoha: fix foe_check_time allocation size
@ 2026-06-16 11:52 Wayen Yan
2026-06-16 12:34 ` Lorenzo Bianconi
0 siblings, 1 reply; 2+ messages in thread
From: Wayen Yan @ 2026-06-16 11:52 UTC (permalink / raw)
To: netdev
Cc: lorenzo, horms, pabeni, kuba, edumazet, andrew+netdev,
angelogioacchino.delregno, matthias.bgg, linux-arm-kernel,
linux-mediatek
foe_check_time is declared as u16 pointer but was allocated with
only ppe_num_entries bytes instead of ppe_num_entries * sizeof(u16).
When airoha_ppe_foe_verify_entry() is called with hash >= ppe_num_entries/2,
it writes beyond the allocated buffer, causing heap buffer overflow and
potential kernel crash.
Fixes: 6d5b601d52a2 ("net: airoha: ppe: Dynamically allocate foe_check_time array in airoha_ppe struct")
Signed-off-by: Wayen Yan <win847@gmail.com>
---
drivers/net/ethernet/airoha/airoha_ppe.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index 5c9dff6bcc..8fb8ecf909 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -1578,7 +1578,8 @@ int airoha_ppe_init(struct airoha_eth *eth)
return -ENOMEM;
}
- ppe->foe_check_time = devm_kzalloc(eth->dev, ppe_num_entries,
+ ppe->foe_check_time = devm_kzalloc(eth->dev,
+ ppe_num_entries * sizeof(*ppe->foe_check_time),
GFP_KERNEL);
if (!ppe->foe_check_time)
return -ENOMEM;
--
2.51.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] [net] net: airoha: fix foe_check_time allocation size
2026-06-16 11:52 [PATCH v2] [net] net: airoha: fix foe_check_time allocation size Wayen Yan
@ 2026-06-16 12:34 ` Lorenzo Bianconi
0 siblings, 0 replies; 2+ messages in thread
From: Lorenzo Bianconi @ 2026-06-16 12:34 UTC (permalink / raw)
To: Wayen Yan
Cc: netdev, horms, pabeni, kuba, edumazet, andrew+netdev,
angelogioacchino.delregno, matthias.bgg, linux-arm-kernel,
linux-mediatek
[-- Attachment #1: Type: text/plain, Size: 1276 bytes --]
> foe_check_time is declared as u16 pointer but was allocated with
> only ppe_num_entries bytes instead of ppe_num_entries * sizeof(u16).
>
> When airoha_ppe_foe_verify_entry() is called with hash >= ppe_num_entries/2,
> it writes beyond the allocated buffer, causing heap buffer overflow and
> potential kernel crash.
>
> Fixes: 6d5b601d52a2 ("net: airoha: ppe: Dynamically allocate foe_check_time array in airoha_ppe struct")
> Signed-off-by: Wayen Yan <win847@gmail.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
> drivers/net/ethernet/airoha/airoha_ppe.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
> index 5c9dff6bcc..8fb8ecf909 100644
> --- a/drivers/net/ethernet/airoha/airoha_ppe.c
> +++ b/drivers/net/ethernet/airoha/airoha_ppe.c
> @@ -1578,7 +1578,8 @@ int airoha_ppe_init(struct airoha_eth *eth)
> return -ENOMEM;
> }
>
> - ppe->foe_check_time = devm_kzalloc(eth->dev, ppe_num_entries,
> + ppe->foe_check_time = devm_kzalloc(eth->dev,
> + ppe_num_entries * sizeof(*ppe->foe_check_time),
> GFP_KERNEL);
> if (!ppe->foe_check_time)
> return -ENOMEM;
> --
> 2.51.0
>
>
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