x86/apic/vector: Fix off by one in error path
authorThomas Gleixner <tglx@linutronix.de>
Tue, 16 Jan 2018 11:20:18 +0000 (12:20 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Wed, 17 Jan 2018 11:11:36 +0000 (12:11 +0100)
commit45d55e7bac4028af93f5fa324e69958a0b868e96
tree92a37940d59f32572927961c3efd0b9e22cd69af
parentd47924417319e3b6a728c0b690f183e75bc2a702
x86/apic/vector: Fix off by one in error path

Keith reported the following warning:

WARNING: CPU: 28 PID: 1420 at kernel/irq/matrix.c:222 irq_matrix_remove_managed+0x10f/0x120
  x86_vector_free_irqs+0xa1/0x180
  x86_vector_alloc_irqs+0x1e4/0x3a0
  msi_domain_alloc+0x62/0x130

The reason for this is that if the vector allocation fails the error
handling code tries to free the failed vector as well, which causes the
above imbalance warning to trigger.

Adjust the error path to handle this correctly.

Fixes: b5dc8e6c21e7 ("x86/irq: Use hierarchical irqdomain to manage CPU interrupt vectors")
Reported-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Keith Busch <keith.busch@intel.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801161217300.1823@nanos
arch/x86/kernel/apic/vector.c