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net: dsa: sja1105: Check return value

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[ Upstream commit 8948876335 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Artem Chernyshev
2022-12-01 17:00:32 +03:00
committed by Greg Kroah-Hartman
parent b749cb7a8d
commit e53e257f3c
1 changed files with 2 additions and 1 deletions
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3
net/dsa/tag_sja1105.c
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@@ -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);