6.12-stable review patch. If anyone has any objections, please let me know.
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From: Bastien Curutchet (Schneider Electric) bastien.curutchet@bootlin.com
commit 9e059305be41a5bd27e03458d8333cf30d70be34 upstream.
irq_find_mapping() returns a positive IRQ number or 0 if no IRQ is found but it never returns a negative value. However, during the PTP IRQ setup, we verify that its returned value isn't negative.
Fix the irq_find_mapping() check to enter the error path when 0 is returned. Return -EINVAL in such case.
Cc: stable@vger.kernel.org Fixes: cc13ab18b201 ("net: dsa: microchip: ptp: enable interrupt for timestamping") Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Bastien Curutchet (Schneider Electric) bastien.curutchet@bootlin.com Link: https://patch.msgid.link/20251120-ksz-fix-v6-2-891f80ae7f8f@bootlin.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/dsa/microchip/ksz_ptp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/dsa/microchip/ksz_ptp.c +++ b/drivers/net/dsa/microchip/ksz_ptp.c @@ -1145,8 +1145,8 @@ int ksz_ptp_irq_setup(struct dsa_switch irq_create_mapping(ptpirq->domain, irq);
ptpirq->irq_num = irq_find_mapping(port->pirq.domain, PORT_SRC_PTP_INT); - if (ptpirq->irq_num < 0) { - ret = ptpirq->irq_num; + if (!ptpirq->irq_num) { + ret = -EINVAL; goto out; }