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62 lines
2.1 KiB
Diff
62 lines
2.1 KiB
Diff
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From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Wed, 7 Dec 2022 15:04:54 +0100
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Subject: [PATCH] net: ethernet: mtk_wed: fix some possible NULL pointer
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dereferences
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Fix possible NULL pointer dereference in mtk_wed_detach routine checking
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wo pointer is properly allocated before running mtk_wed_wo_reset() and
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mtk_wed_wo_deinit().
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Even if it is just a theoretical issue at the moment check wo pointer is
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not NULL in mtk_wed_mcu_msg_update.
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Moreover, honor mtk_wed_mcu_send_msg return value in mtk_wed_wo_reset()
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Fixes: 799684448e3e ("net: ethernet: mtk_wed: introduce wed wo support")
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Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support")
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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--- a/drivers/net/ethernet/mediatek/mtk_wed.c
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+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
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@@ -174,9 +174,10 @@ mtk_wed_wo_reset(struct mtk_wed_device *
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mtk_wdma_tx_reset(dev);
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mtk_wed_reset(dev, MTK_WED_RESET_WED);
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- mtk_wed_mcu_send_msg(wo, MTK_WED_MODULE_ID_WO,
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- MTK_WED_WO_CMD_CHANGE_STATE, &state,
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- sizeof(state), false);
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+ if (mtk_wed_mcu_send_msg(wo, MTK_WED_MODULE_ID_WO,
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+ MTK_WED_WO_CMD_CHANGE_STATE, &state,
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+ sizeof(state), false))
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+ return;
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if (readx_poll_timeout(mtk_wed_wo_read_status, dev, val,
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val == MTK_WED_WOIF_DISABLE_DONE,
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@@ -632,9 +633,11 @@ mtk_wed_detach(struct mtk_wed_device *de
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mtk_wed_free_tx_rings(dev);
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if (mtk_wed_get_rx_capa(dev)) {
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- mtk_wed_wo_reset(dev);
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+ if (hw->wed_wo)
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+ mtk_wed_wo_reset(dev);
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mtk_wed_free_rx_rings(dev);
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- mtk_wed_wo_deinit(hw);
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+ if (hw->wed_wo)
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+ mtk_wed_wo_deinit(hw);
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}
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if (dev->wlan.bus_type == MTK_WED_BUS_PCIE) {
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--- a/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
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+++ b/drivers/net/ethernet/mediatek/mtk_wed_mcu.c
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@@ -207,6 +207,9 @@ int mtk_wed_mcu_msg_update(struct mtk_we
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if (dev->hw->version == 1)
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return 0;
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+ if (WARN_ON(!wo))
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+ return -ENODEV;
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+
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return mtk_wed_mcu_send_msg(wo, MTK_WED_MODULE_ID_WO, id, data, len,
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true);
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}
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