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net: dsa: sja1105: Check return value
Return NULL if we got unexpected value from skb_trim_rcsum() in
sja1110_rcv_inband_control_extension()
Fixes: 4913b8ebf8
("net: dsa: add support for the SJA1110 native tagging protocol")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20221201140032.26746-3-artem.chernyshev@red-soft.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@ -665,7 +665,8 @@ static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb,
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* padding and trailer we need to account for the fact that
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* skb->data points to skb_mac_header(skb) + ETH_HLEN.
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*/
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pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN);
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if (pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN))
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return NULL;
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/* Trap-to-host frame, no timestamp trailer */
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} else {
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*source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header);
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