Commit 47de03be authored by Wenwen Wang's avatar Wenwen Wang Committed by Greg Kroah-Hartman

x86/PCI: Fix PCI IRQ routing table memory leak

[ Upstream commit ea094d53 ]

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: default avatarWenwen 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: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 18d4decc
......@@ -1119,6 +1119,8 @@ static const struct dmi_system_id pciirq_dmi_table[] __initconst = {
void __init pcibios_irq_init(void)
{
struct irq_routing_table *rtable = NULL;
DBG(KERN_DEBUG "PCI: IRQ init\n");
if (raw_pci_ops == NULL)
......@@ -1129,8 +1131,10 @@ 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();
......@@ -1145,8 +1149,10 @@ 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();
......
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