Commit 88806efc034a for kernel

commit 88806efc034a9830f483963326b99930ad519af1
Author: Felix Fietkau <nbd@nbd.name>
Date:   Tue Oct 15 10:17:55 2024 +0200

    net: ethernet: mtk_eth_soc: fix memory corruption during fq dma init

    The loop responsible for allocating up to MTK_FQ_DMA_LENGTH buffers must
    only touch as many descriptors, otherwise it ends up corrupting unrelated
    memory. Fix the loop iteration count accordingly.

    Fixes: c57e55819443 ("net: ethernet: mtk_eth_soc: handle dma buffer size soc specific")
    Signed-off-by: Felix Fietkau <nbd@nbd.name>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Link: https://patch.msgid.link/20241015081755.31060-1-nbd@nbd.name
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 16ca427cf4c3..ed7313c10a05 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1171,7 +1171,7 @@ static int mtk_init_fq_dma(struct mtk_eth *eth)
 		if (unlikely(dma_mapping_error(eth->dma_dev, dma_addr)))
 			return -ENOMEM;

-		for (i = 0; i < cnt; i++) {
+		for (i = 0; i < len; i++) {
 			struct mtk_tx_dma_v2 *txd;

 			txd = eth->scratch_ring + (j * MTK_FQ_DMA_LENGTH + i) * soc->tx.desc_size;