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| author | Wang Chen <wangchen@cn.fujitsu.com> | 2008-12-29 13:35:11 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-29 12:22:29 +0100 |
| commit | efdc64f0c792ea744bcc9203f35b908e66d42f41 (patch) | |
| tree | 014d9895f776d98bf933855e5af2da99d5b34824 /kernel/irq | |
| parent | 860cf8894b326e4b89720f520540604834337b72 (diff) | |
| download | linux-efdc64f0c792ea744bcc9203f35b908e66d42f41.tar.gz linux-efdc64f0c792ea744bcc9203f35b908e66d42f41.tar.bz2 linux-efdc64f0c792ea744bcc9203f35b908e66d42f41.zip | |
genirq: check chip->ack before calling
Impact: fix theoretical NULL dereference
The generic irq layer doesn't know whether irq_chip has ack routine on some
architectures or not. Upon that, before calling chip->ack, we should check
that it's not NULL.
Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/chip.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 6eb3c7952b64..0ad02d76a0c4 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -290,7 +290,8 @@ static inline void mask_ack_irq(struct irq_desc *desc, int irq) desc->chip->mask_ack(irq); else { desc->chip->mask(irq); - desc->chip->ack(irq); + if (desc->chip->ack) + desc->chip->ack(irq); } } @@ -475,7 +476,8 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc) kstat_incr_irqs_this_cpu(irq, desc); /* Start handling the irq */ - desc->chip->ack(irq); + if (desc->chip->ack) + desc->chip->ack(irq); desc = irq_remap_to_desc(irq, desc); /* Mark the IRQ currently in progress.*/ |