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net: hsr: prevent NULL pointer dereference in hsr_proxy_announce()
[ Upstream commit a7789fd ] In the function hsr_proxy_annouance() added in the previous commit 5f703ce ("net: hsr: Send supervisory frames to HSR network with ProxyNodeTable data"), the return value of the hsr_port_get_hsr() function is not checked to be a NULL pointer, which causes a NULL pointer dereference. To solve this, we need to add code to check whether the return value of hsr_port_get_hsr() is NULL. Reported-by: [email protected] Fixes: 5f703ce ("net: hsr: Send supervisory frames to HSR network with ProxyNodeTable data") Signed-off-by: Jeongjun Park <[email protected]> Reviewed-by: Simon Horman <[email protected]> Acked-by: Lukasz Majewski <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
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