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enetc: Fix illegal access when reading affinity_hint

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irq_set_affinity_hit() stores a reference to the cpumask_t
parameter in the irq descriptor, and that reference can be
accessed later from irq_affinity_hint_proc_show(). Since
the cpu_mask parameter passed to irq_set_affinity_hit() has
only temporary storage (it's on the stack memory), later
accesses to it are illegal. Thus reads from the corresponding
procfs affinity_hint file can result in paging request oops.

The issue is fixed by the get_cpu_mask() helper, which provides
a permanent storage for the cpumask_t parameter.

Fixes: d4fd0404c1 ("enetc: Introduce basic PF and VF ENETC ethernet drivers")
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Claudiu Manoil 2021-09-17 13:22:05 +03:00 committed by David S. Miller
parent afd92d82c9
commit 7237a494de
1 changed files with 1 additions and 4 deletions
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5
drivers/net/ethernet/freescale/enetc/enetc.c
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@ -1879,7 +1879,6 @@ static void enetc_clear_bdrs(struct enetc_ndev_priv *priv)
static int enetc_setup_irqs(struct enetc_ndev_priv *priv)
{
struct pci_dev *pdev = priv->si->pdev;
cpumask_t cpu_mask;
int i, j, err;
for (i = 0; i < priv->bdr_int_num; i++) {
@ -1908,9 +1907,7 @@ static int enetc_setup_irqs(struct enetc_ndev_priv *priv)
enetc_wr(hw, ENETC_SIMSITRV(idx), entry);
}
cpumask_clear(&cpu_mask);
cpumask_set_cpu(i % num_online_cpus(), &cpu_mask);
irq_set_affinity_hint(irq, &cpu_mask);
irq_set_affinity_hint(irq, get_cpu_mask(i % num_online_cpus()));
}
return 0;