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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-08-28 11:30:15 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-08-28 11:30:15 +0300 |
| commit | a47d4576cd1c58157a2d8cfffa93aa7ca375eede (patch) | |
| tree | ce12e2951db7b593bc6b9621107758fa0791d5ff | |
| parent | b51aa1cc7807f4dff7b70a762aa6d8814976d706 (diff) | |
| download | linux-a47d4576cd1c58157a2d8cfffa93aa7ca375eede.tar.xz | |
x86/irq: Do not dereference irq descriptor before checking it
Having the IS_NULL_OR_ERR() check after dereferencing the pointer is
not really working well.
Move the dereference after the check.
Fixes: a782a7e46bb5 'x86/irq: Store irq descriptor in vector array'
Reported-and-tested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/irq_32.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index 217b01388038..c80cf6699678 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -150,7 +150,7 @@ void do_softirq_own_stack(void) bool handle_irq(struct irq_desc *desc, struct pt_regs *regs) { - unsigned int irq = irq_desc_get_irq(desc); + unsigned int irq; int overflow; overflow = check_stack_overflow(); @@ -158,6 +158,7 @@ bool handle_irq(struct irq_desc *desc, struct pt_regs *regs) if (IS_ERR_OR_NULL(desc)) return false; + irq = irq_desc_get_irq(desc); if (user_mode(regs) || !execute_on_irq_stack(overflow, desc, irq)) { if (unlikely(overflow)) print_stack_overflow(); |