From: Qian Cai <cai@lca.pw>
To: alex.williamson@redhat.com
Cc: cohuck@redhat.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, Qian Cai <cai@lca.pw>
Subject: [PATCH] vfio/pci: fix memory leaks in alloc_perm_bits()
Date: Sun, 10 May 2020 12:16:56 -0400 [thread overview]
Message-ID: <20200510161656.1415-1-cai@lca.pw> (raw)
vfio_pci_disable() calls vfio_config_free() but forgets to call
free_perm_bits() resulting in memory leaks,
unreferenced object 0xc000000c4db2dee0 (size 16):
comm "qemu-kvm", pid 4305, jiffies 4295020272 (age 3463.780s)
hex dump (first 16 bytes):
00 00 ff 00 ff ff ff ff ff ff ff ff ff ff 00 00 ................
backtrace:
[<00000000a6a4552d>] alloc_perm_bits+0x58/0xe0 [vfio_pci]
[<00000000ac990549>] vfio_config_init+0xdf0/0x11b0 [vfio_pci]
init_pci_cap_msi_perm at drivers/vfio/pci/vfio_pci_config.c:1125
(inlined by) vfio_msi_cap_len at drivers/vfio/pci/vfio_pci_config.c:1180
(inlined by) vfio_cap_len at drivers/vfio/pci/vfio_pci_config.c:1241
(inlined by) vfio_cap_init at drivers/vfio/pci/vfio_pci_config.c:1468
(inlined by) vfio_config_init at drivers/vfio/pci/vfio_pci_config.c:1707
[<000000006db873a1>] vfio_pci_open+0x234/0x700 [vfio_pci]
[<00000000630e1906>] vfio_group_fops_unl_ioctl+0x8e0/0xb84 [vfio]
[<000000009e34c54f>] ksys_ioctl+0xd8/0x130
[<000000006577923d>] sys_ioctl+0x28/0x40
[<000000006d7b1cf2>] system_call_exception+0x114/0x1e0
[<0000000008ea7dd5>] system_call_common+0xf0/0x278
unreferenced object 0xc000000c4db2e330 (size 16):
comm "qemu-kvm", pid 4305, jiffies 4295020272 (age 3463.780s)
hex dump (first 16 bytes):
00 ff ff 00 ff ff ff ff ff ff ff ff ff ff 00 00 ................
backtrace:
[<000000004c71914f>] alloc_perm_bits+0x44/0xe0 [vfio_pci]
[<00000000ac990549>] vfio_config_init+0xdf0/0x11b0 [vfio_pci]
[<000000006db873a1>] vfio_pci_open+0x234/0x700 [vfio_pci]
[<00000000630e1906>] vfio_group_fops_unl_ioctl+0x8e0/0xb84 [vfio]
[<000000009e34c54f>] ksys_ioctl+0xd8/0x130
[<000000006577923d>] sys_ioctl+0x28/0x40
[<000000006d7b1cf2>] system_call_exception+0x114/0x1e0
[<0000000008ea7dd5>] system_call_common+0xf0/0x278
Fixes: 89e1f7d4c66d ("vfio: Add PCI device driver")
Signed-off-by: Qian Cai <cai@lca.pw>
---
drivers/vfio/pci/vfio_pci_config.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 90c0b80f8acf..f9fdc72a5f4e 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1728,6 +1728,7 @@ void vfio_config_free(struct vfio_pci_device *vdev)
vdev->vconfig = NULL;
kfree(vdev->pci_config_map);
vdev->pci_config_map = NULL;
+ free_perm_bits(vdev->msi_perm);
kfree(vdev->msi_perm);
vdev->msi_perm = NULL;
}
--
2.21.0 (Apple Git-122.2)
next reply other threads:[~2020-05-10 16:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-10 16:16 Qian Cai [this message]
2020-05-11 6:35 ` [PATCH] vfio/pci: fix memory leaks in alloc_perm_bits() Cornelia Huck
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