From 0c1f9020d2ada55aed8a2e055903ad9cd5d49dab Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 12 Aug 2026 11:38:30 -0500 Subject: [PATCH] net: stmmac: use dma_addr_t for DMA addresses In jumbo_frm() (implemented in both "chain_mode.c" and "ring_mode.c"), an unsigned integer local variable is used to hold the value returned by dma_map_single(). On systems where a dma_addr_t is 64 bits, the subsequent dma_mapping_error() check of the returned value operates only on the low 32 bits (whose high bit won't be sign-extended). In this case, dma_mapping_error() would return 0 (no error) even if there were one. Fix this in both spots by using a dma_addr_t for the local variable. Reported-by: Sashiko Link: https://lore.kernel.org/linux-devicetree/20260606010122.21A211F00899@smtp.kernel.org/ Reviewed-by: Maxime Chevallier Signed-off-by: Alex Elder Link: https://patch.msgid.link/20260812163832.271742-2-elder@riscstar.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/stmicro/stmmac/chain_mode.c | 3 ++- drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c index fc04a23342cf..ec25193d287b 100644 --- a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c +++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c @@ -20,9 +20,10 @@ static int jumbo_frm(struct stmmac_tx_queue *tx_q, struct sk_buff *skb, unsigned int nopaged_len = skb_headlen(skb); struct stmmac_priv *priv = tx_q->priv_data; unsigned int entry = tx_q->cur_tx; - unsigned int bmax, buf_len, des2; + unsigned int bmax, buf_len; unsigned int i = 1, len; struct dma_desc *desc; + dma_addr_t des2; desc = tx_q->dma_tx + entry; diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c index 78fc6aa5bbe9..664d8cfb58cd 100644 --- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c +++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c @@ -20,8 +20,9 @@ static int jumbo_frm(struct stmmac_tx_queue *tx_q, struct sk_buff *skb, unsigned int nopaged_len = skb_headlen(skb); struct stmmac_priv *priv = tx_q->priv_data; unsigned int entry = tx_q->cur_tx; - unsigned int bmax, len, des2; + unsigned int bmax, len; struct dma_desc *desc; + dma_addr_t des2; if (priv->extend_desc) desc = (struct dma_desc *)(tx_q->dma_etx + entry);