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[ Upstream commit3d8fdcbf1f] Return NULL if we got unexpected value from skb_trim_rcsum() in ksz_common_rcv() Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes:bafe9ba7d9("net: dsa: ksz: Factor out common tag code") Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20221201140032.26746-1-artem.chernyshev@red-soft.ru Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>