6.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Roger Quadros <rogerq@xxxxxxxxxx>
commit 0a50c35277f96481a5a6ed5faf347f282040c57d upstream.
If number of TX queues are set to 1 we get a NULL pointer
dereference during XDP_TX.
~# ethtool -L eth0 tx 1
~# ./xdp-trafficgen udp -A <ipv6-src> -a <ipv6-dst> eth0 -t 2
Transmitting on eth0 (ifindex 2)
[ 241.135257] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030
Fix this by using actual TX queues instead of max TX queues
when picking the TX channel in am65_cpsw_ndo_xdp_xmit().
Fixes: 8acacc40f733 ("net: ethernet: ti: am65-cpsw: Add minimal XDP support")
Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
Acked-by: Julien Panis <jpanis@xxxxxxxxxxxx>
Reviewed-by: MD Danish Anwar <danishanwar@xxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1918,12 +1918,13 @@ static int am65_cpsw_ndo_bpf(struct net_
static int am65_cpsw_ndo_xdp_xmit(struct net_device *ndev, int n,
struct xdp_frame **frames, u32 flags)
{
+ struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
struct am65_cpsw_tx_chn *tx_chn;
struct netdev_queue *netif_txq;
int cpu = smp_processor_id();
int i, nxmit = 0;
- tx_chn = &am65_ndev_to_common(ndev)->tx_chns[cpu % AM65_CPSW_MAX_TX_QUEUES];
+ tx_chn = &common->tx_chns[cpu % common->tx_ch_num];
netif_txq = netdev_get_tx_queue(ndev, tx_chn->id);
__netif_tx_lock(netif_txq, cpu);
