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

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>
pull/1258/merge
Alexis Lothoré 2025-05-29 11:07:24 +02:00 committed by Jakub Kicinski
parent 030ce919e1
commit cbefe2ffa7
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/stmicro/stmmac/stmmac_est.c
View File

@ -32,6 +32,11 @@ static int est_configure(struct stmmac_priv *priv, struct stmmac_est *cfg,
int i, ret = 0;
u32 ctrl;
if (!ptp_rate) {
netdev_warn(priv->dev, "Invalid PTP rate");
return -EINVAL;
}
ret |= est_write(est_addr, EST_BTR_LOW, cfg->btr[0], false);
ret |= est_write(est_addr, EST_BTR_HIGH, cfg->btr[1], false);
ret |= est_write(est_addr, EST_TER, cfg->ter, false);