diff options
| author | Sergey Shtylyov <s.shtylyov@omp.ru> | 2022-08-17 23:00:45 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2023-02-20 15:53:41 +0300 |
| commit | feabecaff5902f896531dde90646ca5dfa9d4f7d (patch) | |
| tree | a8b173dcc4edbea56200dcda2f0653c211b0c294 /kernel/irq | |
| parent | c9c3395d5e3dcc6daee66c6908354d47bf98cb0c (diff) | |
| download | linux-feabecaff5902f896531dde90646ca5dfa9d4f7d.tar.xz | |
genirq/ipi: Fix NULL pointer deref in irq_data_get_affinity_mask()
If ipi_send_{mask|single}() is called with an invalid interrupt number, all
the local variables there will be NULL. ipi_send_verify() which is invoked
from these functions does verify its 'data' parameter, resulting in a
kernel oops in irq_data_get_affinity_mask() as the passed NULL pointer gets
dereferenced.
Add a missing NULL pointer check in ipi_send_verify()...
Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.
Fixes: 3b8e29a82dd1 ("genirq: Implement ipi_send_mask/single()")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/b541232d-c2b6-1fe9-79b4-a7129459e4d0@omp.ru
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/ipi.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c index bbd945bacef0..961d4af76af3 100644 --- a/kernel/irq/ipi.c +++ b/kernel/irq/ipi.c @@ -188,9 +188,9 @@ EXPORT_SYMBOL_GPL(ipi_get_hwirq); static int ipi_send_verify(struct irq_chip *chip, struct irq_data *data, const struct cpumask *dest, unsigned int cpu) { - const struct cpumask *ipimask = irq_data_get_affinity_mask(data); + const struct cpumask *ipimask; - if (!chip || !ipimask) + if (!chip || !data) return -EINVAL; if (!chip->ipi_send_single && !chip->ipi_send_mask) @@ -199,6 +199,10 @@ static int ipi_send_verify(struct irq_chip *chip, struct irq_data *data, if (cpu >= nr_cpu_ids) return -EINVAL; + ipimask = irq_data_get_affinity_mask(data); + if (!ipimask) + return -EINVAL; + if (dest) { if (!cpumask_subset(dest, ipimask)) return -EINVAL; |