From: Artem Chernyshev Date: Thu, 1 Dec 2022 14:00:32 +0000 (+0300) Subject: net: dsa: sja1105: Check return value X-Git-Tag: v6.1~9^2~43 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8948876335b1752176afdff8e704099a3ea0f6e6;p=platform%2Fkernel%2Flinux-starfive.git net: dsa: sja1105: Check return value Return NULL if we got unexpected value from skb_trim_rcsum() in sja1110_rcv_inband_control_extension() Fixes: 4913b8ebf8a9 ("net: dsa: add support for the SJA1110 native tagging protocol") Signed-off-by: Artem Chernyshev Reviewed-by: Florian Fainelli Link: https://lore.kernel.org/r/20221201140032.26746-3-artem.chernyshev@red-soft.ru Signed-off-by: Jakub Kicinski --- diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c index 83e4136..1a85125 100644 --- a/net/dsa/tag_sja1105.c +++ b/net/dsa/tag_sja1105.c @@ -665,7 +665,8 @@ static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb, * padding and trailer we need to account for the fact that * skb->data points to skb_mac_header(skb) + ETH_HLEN. */ - pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN); + if (pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN)) + return NULL; /* Trap-to-host frame, no timestamp trailer */ } else { *source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header);