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bcm4908: backport bcm4908_enet fix for NULL dereference 

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 31e4e56654)
This commit is contained in:
Rafał Miłecki 2022-10-27 21:05:20 +02:00
parent da4e3881ea
commit 973c18fb8c
4 changed files with 103 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
target/linux/bcm4908/patches-5.4/077-v5.17-net-broadcom-bcm4908enet-remove-redundant-variable-b.patch Normal file
View File

@ -0,0 +1,34 @@
From 62a3106697f3c6f9af64a2cd0f9ff58552010dc8 Mon Sep 17 00:00:00 2001
From: Colin Ian King <colin.i.king@gmail.com>
Date: Wed, 22 Dec 2021 00:39:37 +0000
Subject: [PATCH] net: broadcom: bcm4908enet: remove redundant variable bytes
The variable bytes is being used to summate slot lengths,
however the value is never used afterwards. The summation
is redundant so remove variable bytes.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20211222003937.727325-1-colin.i.king@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm4908_enet.c | 2 --
1 file changed, 2 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -634,7 +634,6 @@ static int bcm4908_enet_poll_tx(struct n
struct bcm4908_enet_dma_ring_bd *buf_desc;
struct bcm4908_enet_dma_ring_slot *slot;
struct device *dev = enet->dev;
- unsigned int bytes = 0;
int handled = 0;
while (handled < weight && tx_ring->read_idx != tx_ring->write_idx) {
@@ -645,7 +644,6 @@ static int bcm4908_enet_poll_tx(struct n
dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE);
dev_kfree_skb(slot->skb);
- bytes += slot->len;
if (++tx_ring->read_idx == tx_ring->length)
tx_ring->read_idx = 0;

4
target/linux/bcm4908/patches-5.4/078-v6.1-net-broadcom-bcm4908_enet-handle-EPROBE_DEFER-when-g.patch → target/linux/bcm4908/patches-5.4/078-v6.1-0001-net-broadcom-bcm4908_enet-handle-EPROBE_DEFER-when-g.patch
View File

@ -20,7 +20,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -716,10 +716,14 @@ static int bcm4908_enet_probe(struct pla
@@ -714,10 +714,14 @@ static int bcm4908_enet_probe(struct pla
SET_NETDEV_DEV(netdev, &pdev->dev);
mac = of_get_mac_address(dev->of_node);
@ -37,7 +37,7 @@ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
netdev->netdev_ops = &bcm4908_enet_netdev_ops;
netdev->min_mtu = ETH_ZLEN;
netdev->mtu = ETH_DATA_LEN;
@@ -728,14 +732,17 @@ static int bcm4908_enet_probe(struct pla
@@ -726,14 +730,17 @@ static int bcm4908_enet_probe(struct pla
netif_napi_add(netdev, &enet->rx_ring.napi, bcm4908_enet_poll_rx, NAPI_POLL_WEIGHT);
err = register_netdev(netdev);

65
target/linux/bcm4908/patches-5.4/078-v6.1-0002-net-broadcom-bcm4908_enet-update-TX-stats-after-actu.patch Normal file
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@ -0,0 +1,65 @@
From ef3556ee16c68735ec69bd08df41d1cd83b14ad3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
Date: Thu, 27 Oct 2022 13:24:30 +0200
Subject: [PATCH] net: broadcom: bcm4908_enet: update TX stats after actual
transmission
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Queueing packets doesn't guarantee their transmission. Update TX stats
after hardware confirms consuming submitted data.
This also fixes a possible race and NULL dereference.
bcm4908_enet_start_xmit() could try to access skb after freeing it in
the bcm4908_enet_poll_tx().
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Fixes: 4feffeadbcb2e ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20221027112430.8696-1-zajec5@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm4908_enet.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -560,8 +560,6 @@ static int bcm4908_enet_start_xmit(struc
if (++ring->write_idx == ring->length - 1)
ring->write_idx = 0;
- enet->netdev->stats.tx_bytes += skb->len;
- enet->netdev->stats.tx_packets++;
return NETDEV_TX_OK;
}
@@ -634,6 +632,7 @@ static int bcm4908_enet_poll_tx(struct n
struct bcm4908_enet_dma_ring_bd *buf_desc;
struct bcm4908_enet_dma_ring_slot *slot;
struct device *dev = enet->dev;
+ unsigned int bytes = 0;
int handled = 0;
while (handled < weight && tx_ring->read_idx != tx_ring->write_idx) {
@@ -644,12 +643,17 @@ static int bcm4908_enet_poll_tx(struct n
dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE);
dev_kfree_skb(slot->skb);
- if (++tx_ring->read_idx == tx_ring->length)
- tx_ring->read_idx = 0;
handled++;
+ bytes += slot->len;
+
+ if (++tx_ring->read_idx == tx_ring->length)
+ tx_ring->read_idx = 0;
}
+ enet->netdev->stats.tx_packets += handled;
+ enet->netdev->stats.tx_bytes += bytes;
+
if (handled < weight) {
napi_complete_done(napi, handled);
bcm4908_enet_dma_ring_intrs_on(enet, tx_ring);

4
target/linux/bcm4908/patches-5.4/079-v6.2-0001-net-broadcom-bcm4908_enet-use-build_skb.patch
View File

@ -112,7 +112,7 @@ Signed-off-by: Paolo Abeni <pabeni@redhat.com>
}
}
@@ -576,6 +586,7 @@ static int bcm4908_enet_poll_rx(struct n
@@ -574,6 +584,7 @@ static int bcm4908_enet_poll_rx(struct n
while (handled < weight) {
struct bcm4908_enet_dma_ring_bd *buf_desc;
struct bcm4908_enet_dma_ring_slot slot;
@ -120,7 +120,7 @@ Signed-off-by: Paolo Abeni <pabeni@redhat.com>
u32 ctl;
int len;
int err;
@@ -599,16 +610,24 @@ static int bcm4908_enet_poll_rx(struct n
@@ -597,16 +608,24 @@ static int bcm4908_enet_poll_rx(struct n
if (len < ETH_ZLEN ||
(ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {