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authorVladimir Oltean <vladimir.oltean@nxp.com>2022-06-29 21:33:58 +0200
committerJakub Kicinski <kuba@kernel.org>2022-06-30 21:18:28 +0200
commitb7d78b46d5e8dc77c656c13885d31e931923b915 (patch)
tree90e430f7a13c8256b4b350bd896a6a4a1c80b07f /mm/madvise.c
parentMerge branch 'net-neigh-introduce-interval_probe_time-for-periodic-probe' (diff)
downloadlinux-b7d78b46d5e8dc77c656c13885d31e931923b915.tar.xz
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net: phylink: fix NULL pl->pcs dereference during phylink_pcs_poll_start
The current link mode of the phylink instance may not require an attached PCS. However, phylink_major_config() unconditionally dereferences this potentially NULL pointer when restarting the link poll timer, which will panic the kernel. Fix the problem by checking whether a PCS exists in phylink_pcs_poll_start(), otherwise do nothing. The code prior to the blamed patch also only looked at pcs->poll within an "if (pcs)" block. Fixes: bfac8c490d60 ("net: phylink: disable PCS polling over major configuration") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Tested-by: Gerhard Engleder <gerhard@engleder-embedded.com> Tested-by: Michael Walle <michael@walle.cc> # on kontron-kbox-a-230-ls Tested-by: Nicolas Ferre <nicolas.ferre@microchip.com> # on sam9x60ek Link: https://lore.kernel.org/r/20220629193358.4007923-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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