net: stmmac: make sure that ptp_rate is not 0 before configuring EST

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[ Upstream commit cbefe2ffa7 ]

If the ptp_rate recorded earlier in the driver happens to be 0, this
bogus value will propagate up to EST configuration, where it will
trigger a division by 0.

Prevent this division by 0 by adding the corresponding check and error
code.

Suggested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Fixes: 8572aec3d0 ("net: stmmac: Add basic EST support for XGMAC")
Link: https://patch.msgid.link/20250529-stmmac_tstamp_div-v4-2-d73340a794d5@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Alexis Lothoré 2025-05-29 11:07:24 +02:00 • committed by Greg Kroah-Hartman

parent bb033c6781

commit 451ee661d0

1 changed files with 5 additions and 0 deletions

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drivers/net/ethernet/stmicro/stmmac/stmmac_est.c

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