The IRQ handler extracts if_id from the upper 16 bits of the hardware status register and uses it to index into ethsw->ports[] without validation. Since if_id can be any 16-bit value (0-65535) but the ports array is only allocated with sw_attr.num_ifs elements, this can lead to an out-of-bounds read potentially. Add a bounds check before accessing the array, consistent with the existing validation in dpaa2_switch_rx(). Reported-by: Yuhao Jiang Reported-by: Junrui Luo Fixes: 24ab724f8a46 ("dpaa2-switch: use the port index in the IRQ handler") Signed-off-by: Junrui Luo --- drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c index b1e1ad9e4b48..33f0842b5dc9 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c @@ -1531,6 +1531,10 @@ static irqreturn_t dpaa2_switch_irq0_handler_thread(int irq_num, void *arg) } if_id = (status & 0xFFFF0000) >> 16; + if (if_id >= ethsw->sw_attr.num_ifs) { + dev_err(dev, "Invalid if_id %d in IRQ status\n", if_id); + goto out; + } port_priv = ethsw->ports[if_id]; if (status & DPSW_IRQ_EVENT_LINK_CHANGED) --- base-commit: a040afa3bca415019d96a586b96b5f17b1f55a90 change-id: 20260129-fixes-98a0f7607a88 Best regards, -- Junrui Luo