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39 lines
1.6 KiB
Diff
39 lines
1.6 KiB
Diff
From b7d78b46d5e8dc77c656c13885d31e931923b915 Mon Sep 17 00:00:00 2001
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
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Date: Wed, 29 Jun 2022 22:33:58 +0300
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Subject: [PATCH] net: phylink: fix NULL pl->pcs dereference during
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phylink_pcs_poll_start
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The current link mode of the phylink instance may not require an
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attached PCS. However, phylink_major_config() unconditionally
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dereferences this potentially NULL pointer when restarting the link poll
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timer, which will panic the kernel.
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Fix the problem by checking whether a PCS exists in phylink_pcs_poll_start(),
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otherwise do nothing. The code prior to the blamed patch also only
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looked at pcs->poll within an "if (pcs)" block.
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Fixes: bfac8c490d60 ("net: phylink: disable PCS polling over major configuration")
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Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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Tested-by: Gerhard Engleder <gerhard@engleder-embedded.com>
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Tested-by: Michael Walle <michael@walle.cc> # on kontron-kbox-a-230-ls
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Tested-by: Nicolas Ferre <nicolas.ferre@microchip.com> # on sam9x60ek
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Link: https://lore.kernel.org/r/20220629193358.4007923-1-vladimir.oltean@nxp.com
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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drivers/net/phy/phylink.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/net/phy/phylink.c
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+++ b/drivers/net/phy/phylink.c
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@@ -767,7 +767,7 @@ static void phylink_pcs_poll_stop(struct
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static void phylink_pcs_poll_start(struct phylink *pl)
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{
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- if (pl->pcs->poll && pl->cfg_link_an_mode == MLO_AN_INBAND)
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+ if (pl->pcs && pl->pcs->poll && pl->cfg_link_an_mode == MLO_AN_INBAND)
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mod_timer(&pl->link_poll, jiffies + HZ);
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}
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