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net: dsa: microchip: Don't free uninitialized ksz_irq 

If something goes wrong at setup, ksz_irq_free() can be called on
uninitialized ksz_irq (for example when ksz_ptp_irq_setup() fails). It
leads to freeing uninitialized IRQ numbers and/or domains.

Use dsa_switch_for_each_user_port_continue_reverse() in the error path
to iterate only over the fully initialized ports.

Cc: stable@vger.kernel.org
Fixes: cc13ab18b2 ("net: dsa: microchip: ptp: enable interrupt for timestamping")
Signed-off-by: Bastien Curutchet (Schneider Electric) <bastien.curutchet@bootlin.com>
Link: https://patch.msgid.link/20251120-ksz-fix-v6-3-891f80ae7f8f@bootlin.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Bastien Curutchet (Schneider Electric) 2025-11-20 10:12:02 +01:00 committed by Paolo Abeni
parent 9e059305be
commit 25b62cc5b2
1 changed files with 1 additions and 1 deletions
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2
drivers/net/dsa/microchip/ksz_common.c
View File

@ -3082,7 +3082,7 @@ static int ksz_setup(struct dsa_switch *ds)
ksz_ptp_irq_free(ds, dp->index);
out_pirq:
if (dev->irq > 0)
dsa_switch_for_each_user_port(dp, dev->ds)
dsa_switch_for_each_user_port_continue_reverse(dp, dev->ds)
ksz_irq_free(&dev->ports[dp->index].pirq);
out_girq:
if (dev->irq > 0)