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net: dsa: tag_brcm: legacy: fix pskb_may_pull length 

[ Upstream commit efdddc4484859082da6c7877ed144c8121c8ea55 ]

BRCM_LEG_PORT_ID was incorrectly used for pskb_may_pull length.
The correct check is BRCM_LEG_TAG_LEN + VLAN_HLEN, or 10 bytes.

Fixes: 964dbf186e ("net: dsa: tag_brcm: add support for legacy tags")
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20250529124406.2513779-1-noltari@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 2e02edb66427e3b8752e1f3dd3cfc1bef3f2357b)
This commit is contained in:
Álvaro Fernández Rojas 2025-05-29 14:44:06 +02:00 committed by Wentao Guan
parent 278cc406d3
commit 2022234698
1 changed files with 1 additions and 1 deletions
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2
net/dsa/tag_brcm.c
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@ -257,7 +257,7 @@ static struct sk_buff *brcm_leg_tag_rcv(struct sk_buff *skb,
int source_port;
u8 *brcm_tag;
if (unlikely(!pskb_may_pull(skb, BRCM_LEG_PORT_ID)))
if (unlikely(!pskb_may_pull(skb, BRCM_LEG_TAG_LEN + VLAN_HLEN)))
return NULL;
brcm_tag = dsa_etype_header_pos_rx(skb);