The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes() but never validates it against DPSW_MAX_IF (64). This value controls iteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices into the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports num_ifs >= 64, the loop can write past the array bounds. Add a bound check for num_ifs in dpaa2_switch_init(). Reported-by: Yuhao Jiang Reported-by: Junrui Luo Fixes: f054e3e217e4 ("dpaa2-switch: refactor the egress flooding domain setup") Signed-off-by: Junrui Luo --- drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c index 66240c340492..78e21b46a5ba 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c @@ -3034,6 +3034,13 @@ static int dpaa2_switch_init(struct fsl_mc_device *sw_dev) goto err_close; } + if (ethsw->sw_attr.num_ifs >= DPSW_MAX_IF) { + dev_err(dev, "DPSW num_ifs %u exceeds max %u\n", + ethsw->sw_attr.num_ifs, DPSW_MAX_IF); + err = -EINVAL; + goto err_close; + } + err = dpsw_get_api_version(ethsw->mc_io, 0, ðsw->major, ðsw->minor); --- base-commit: 9702969978695d9a699a1f34771580cdbb153b33 change-id: 20260217-fixes-32df5449b0ab Best regards, -- Junrui Luo