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kernel: fix mtk_eth_soc memory corruption issue on fq dma init

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2024-10-15 10:21:47 +02:00
parent 1bd6dda198
commit 506d0c421b
1 changed files with 24 additions and 0 deletions
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target/linux/generic/pending-6.6/735-net-ethernet-mtk_eth_soc-fix-memory-corruption-durin.patch Normal file
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From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 15 Oct 2024 10:13:55 +0200
Subject: [PATCH] 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>
---
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1172,7 +1172,7 @@ static int mtk_init_fq_dma(struct mtk_et
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;