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net: stmmac: Fix accessing freed irq affinity_hint

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[ Upstream commit c60d101a226f18e9a8f01bb4c6ca2b47dfcb15ef ]

The cpumask should not be a local variable, since its pointer is saved
to irq_desc and may be accessed from procfs.
To fix it, use the persistent mask cpumask_of(cpu#).

Cc: stable@vger.kernel.org
Fixes: 8deec94c60 ("net: stmmac: set IRQ affinity hint for multi MSI vectors")
Signed-off-by: Qingfang Deng <dqfext@gmail.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20250318032424.112067-1-dqfext@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Rajani Kantha <681739313@139.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qingfang Deng
2025-11-21 14:00:37 +08:00
committed by Greg Kroah-Hartman
parent ef49378864
commit 960dab23f6
1 changed files with 4 additions and 7 deletions
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11
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@@ -3516,7 +3516,6 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
{
struct stmmac_priv *priv = netdev_priv(dev);
enum request_irq_err irq_err;
cpumask_t cpu_mask;
int irq_idx = 0;
char *int_name;
int ret;
@@ -3628,9 +3627,8 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
irq_idx = i;
goto irq_error;
}
cpumask_clear(&cpu_mask);
cpumask_set_cpu(i % num_online_cpus(), &cpu_mask);
irq_set_affinity_hint(priv->rx_irq[i], &cpu_mask);
irq_set_affinity_hint(priv->rx_irq[i],
cpumask_of(i % num_online_cpus()));
}
/* Request Tx MSI irq */
@@ -3653,9 +3651,8 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
irq_idx = i;
goto irq_error;
}
cpumask_clear(&cpu_mask);
cpumask_set_cpu(i % num_online_cpus(), &cpu_mask);
irq_set_affinity_hint(priv->tx_irq[i], &cpu_mask);
irq_set_affinity_hint(priv->tx_irq[i],
cpumask_of(i % num_online_cpus()));
}
return 0;