netdev - [PATCH net] net: stmmac: fix dma queue left shift overflow issue

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Date:   Fri, 15 Jul 2022 15:47:01 +0800
From:   Junxiao Chang <junxiao.chang@...el.com>
To:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, netdev@...r.kernel.org
Cc:     edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        mcoquelin.stm32@...il.com, Joao.Pinto@...opsys.com,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, cedric@...espeed.nl,
        f.fainelli@...il.com
Subject: [PATCH net] net: stmmac: fix dma queue left shift overflow issue

When queue number is > 4, left shift overflows due to 32 bits
integer variable. Mask calculation is wrong for MTL_RXQ_DMA_MAP1.

If CONFIG_UBSAN is enabled, kernel dumps below warning:
[   10.363842] ==================================================================
[   10.363882] UBSAN: shift-out-of-bounds in /build/linux-intel-iotg-5.15-8e6Tf4/
linux-intel-iotg-5.15-5.15.0/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:224:12
[   10.363929] shift exponent 40 is too large for 32-bit type 'unsigned int'
[   10.363953] CPU: 1 PID: 599 Comm: NetworkManager Not tainted 5.15.0-1003-intel-iotg
[   10.363956] Hardware name: ADLINK Technology Inc. LEC-EL/LEC-EL, BIOS 0.15.11 12/22/2021
[   10.363958] Call Trace:
[   10.363960]  <TASK>
[   10.363963]  dump_stack_lvl+0x4a/0x5f
[   10.363971]  dump_stack+0x10/0x12
[   10.363974]  ubsan_epilogue+0x9/0x45
[   10.363976]  __ubsan_handle_shift_out_of_bounds.cold+0x61/0x10e
[   10.363979]  ? wake_up_klogd+0x4a/0x50
[   10.363983]  ? vprintk_emit+0x8f/0x240
[   10.363986]  dwmac4_map_mtl_dma.cold+0x42/0x91 [stmmac]
[   10.364001]  stmmac_mtl_configuration+0x1ce/0x7a0 [stmmac]
[   10.364009]  ? dwmac410_dma_init_channel+0x70/0x70 [stmmac]
[   10.364020]  stmmac_hw_setup.cold+0xf/0xb14 [stmmac]
[   10.364030]  ? page_pool_alloc_pages+0x4d/0x70
[   10.364034]  ? stmmac_clear_tx_descriptors+0x6e/0xe0 [stmmac]
[   10.364042]  stmmac_open+0x39e/0x920 [stmmac]
[   10.364050]  __dev_open+0xf0/0x1a0
[   10.364054]  __dev_change_flags+0x188/0x1f0
[   10.364057]  dev_change_flags+0x26/0x60
[   10.364059]  do_setlink+0x908/0xc40
[   10.364062]  ? do_setlink+0xb10/0xc40
[   10.364064]  ? __nla_validate_parse+0x4c/0x1a0
[   10.364068]  __rtnl_newlink+0x597/0xa10
[   10.364072]  ? __nla_reserve+0x41/0x50
[   10.364074]  ? __kmalloc_node_track_caller+0x1d0/0x4d0
[   10.364079]  ? pskb_expand_head+0x75/0x310
[   10.364082]  ? nla_reserve_64bit+0x21/0x40
[   10.364086]  ? skb_free_head+0x65/0x80
[   10.364089]  ? security_sock_rcv_skb+0x2c/0x50
[   10.364094]  ? __cond_resched+0x19/0x30
[   10.364097]  ? kmem_cache_alloc_trace+0x15a/0x420
[   10.364100]  rtnl_newlink+0x49/0x70

This change fixes MTL_RXQ_DMA_MAP1 mask issue and channel/queue
mapping warning.

Fixes: d43042f4da3e ("net: stmmac: mapping mtl rx to dma channel")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=216195
Reported-by: Cedric Wassenaar <cedric@...espeed.nl>
Signed-off-by: Junxiao Chang <junxiao.chang@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index fd41db65fe1df..af33390411346 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -219,6 +219,9 @@ static void dwmac4_map_mtl_dma(struct mac_device_info *hw, u32 queue, u32 chan)
 	if (queue == 0 || queue == 4) {
 		value &= ~MTL_RXQ_DMA_Q04MDMACH_MASK;
 		value |= MTL_RXQ_DMA_Q04MDMACH(chan);
+	} else if (queue > 4) {
+		value &= ~MTL_RXQ_DMA_QXMDMACH_MASK(queue - 4);
+		value |= MTL_RXQ_DMA_QXMDMACH(chan, queue - 4);
 	} else {
 		value &= ~MTL_RXQ_DMA_QXMDMACH_MASK(queue);
 		value |= MTL_RXQ_DMA_QXMDMACH(chan, queue);
-- 
2.25.1