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| author | Wenwen Wang <wang6495@umn.edu> | 2019-04-17 09:18:50 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-22 08:18:20 +0200 |
| commit | c7155e51cf85acc839822a9872d8bfbec53ef132 (patch) | |
| tree | 07cdacca0b1618a479855adb79199818a3f0ea74 /arch/x86 | |
| parent | 198a54f07f51d4f52503ae611e0b0c1e8e445cef (diff) | |
| download | linux-stable-c7155e51cf85acc839822a9872d8bfbec53ef132.tar.gz linux-stable-c7155e51cf85acc839822a9872d8bfbec53ef132.tar.bz2 linux-stable-c7155e51cf85acc839822a9872d8bfbec53ef132.zip | |
x86/PCI: Fix PCI IRQ routing table memory leak
[ Upstream commit ea094d53580f40c2124cef3d072b73b2425e7bfd ]
In pcibios_irq_init(), the PCI IRQ routing table 'pirq_table' is first
found through pirq_find_routing_table(). If the table is not found and
CONFIG_PCI_BIOS is defined, the table is then allocated in
pcibios_get_irq_routing_table() using kmalloc(). Later, if the I/O APIC is
used, this table is actually not used. In that case, the allocated table
is not freed, which is a memory leak.
Free the allocated table if it is not used.
Signed-off-by: Wenwen Wang <wang6495@umn.edu>
[bhelgaas: added Ingo's reviewed-by, since the only change since v1 was to
use the irq_routing_table local variable name he suggested]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/pci/irq.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c index 9bd115484745..5f0e596b0519 100644 --- a/arch/x86/pci/irq.c +++ b/arch/x86/pci/irq.c @@ -1117,6 +1117,8 @@ static struct dmi_system_id __initdata pciirq_dmi_table[] = { void __init pcibios_irq_init(void) { + struct irq_routing_table *rtable = NULL; + DBG(KERN_DEBUG "PCI: IRQ init\n"); if (raw_pci_ops == NULL) @@ -1127,8 +1129,10 @@ void __init pcibios_irq_init(void) pirq_table = pirq_find_routing_table(); #ifdef CONFIG_PCI_BIOS - if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN)) + if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN)) { pirq_table = pcibios_get_irq_routing_table(); + rtable = pirq_table; + } #endif if (pirq_table) { pirq_peer_trick(); @@ -1143,8 +1147,10 @@ void __init pcibios_irq_init(void) * If we're using the I/O APIC, avoid using the PCI IRQ * routing table */ - if (io_apic_assign_pci_irqs) + if (io_apic_assign_pci_irqs) { + kfree(rtable); pirq_table = NULL; + } } x86_init.pci.fixup_irqs(); |