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| author | Alex Williamson <alex.williamson@redhat.com> | 2014-10-31 11:13:07 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-16 06:59:50 -0800 |
| commit | 27be783535d48df13f70d5c79ead86f8a7cb3e11 (patch) | |
| tree | 83a6c8ecdc7b4f1b162864a3bac2042c747d7175 /drivers/misc | |
| parent | ccf8296923d31dd16e9b8857213fa671d1252bb1 (diff) | |
driver core: Fix unbalanced device reference in drivers_probe
commit bb34cb6bbd287b57e955bc5cfd42fcde6aaca279 upstream.
bus_find_device_by_name() acquires a device reference which is never
released. This results in an object leak, which on older kernels
results in failure to release all resources of PCI devices. libvirt
uses drivers_probe to re-attach devices to the host after assignment
and is therefore a common trigger for this leak.
Example:
# cd /sys/bus/pci/
# dmesg -C
# echo 1 > devices/0000\:01\:00.0/sriov_numvfs
# echo 0 > devices/0000\:01\:00.0/sriov_numvfs
# dmesg | grep 01:10
pci 0000:01:10.0: [8086:10ca] type 00 class 0x020000
kobject: '0000:01:10.0' (ffff8801d79cd0a8): kobject_add_internal: parent: '0000:00:01.0', set: 'devices'
kobject: '0000:01:10.0' (ffff8801d79cd0a8): kobject_uevent_env
kobject: '0000:01:10.0' (ffff8801d79cd0a8): fill_kobj_path: path = '/devices/pci0000:00/0000:00:01.0/0000:01:10.0'
kobject: '0000:01:10.0' (ffff8801d79cd0a8): kobject_uevent_env
kobject: '0000:01:10.0' (ffff8801d79cd0a8): fill_kobj_path: path = '/devices/pci0000:00/0000:00:01.0/0000:01:10.0'
kobject: '0000:01:10.0' (ffff8801d79cd0a8): kobject_uevent_env
kobject: '0000:01:10.0' (ffff8801d79cd0a8): fill_kobj_path: path = '/devices/pci0000:00/0000:00:01.0/0000:01:10.0'
kobject: '0000:01:10.0' (ffff8801d79cd0a8): kobject_cleanup, parent (null)
kobject: '0000:01:10.0' (ffff8801d79cd0a8): calling ktype release
kobject: '0000:01:10.0': free name
[kobject freed as expected]
# dmesg -C
# echo 1 > devices/0000\:01\:00.0/sriov_numvfs
# echo 0000:01:10.0 > drivers_probe
# echo 0 > devices/0000\:01\:00.0/sriov_numvfs
# dmesg | grep 01:10
pci 0000:01:10.0: [8086:10ca] type 00 class 0x020000
kobject: '0000:01:10.0' (ffff8801d79ce0a8): kobject_add_internal: parent: '0000:00:01.0', set: 'devices'
kobject: '0000:01:10.0' (ffff8801d79ce0a8): kobject_uevent_env
kobject: '0000:01:10.0' (ffff8801d79ce0a8): fill_kobj_path: path = '/devices/pci0000:00/0000:00:01.0/0000:01:10.0'
kobject: '0000:01:10.0' (ffff8801d79ce0a8): kobject_uevent_env
kobject: '0000:01:10.0' (ffff8801d79ce0a8): fill_kobj_path: path = '/devices/pci0000:00/0000:00:01.0/0000:01:10.0'
kobject: '0000:01:10.0' (ffff8801d79ce0a8): kobject_uevent_env
kobject: '0000:01:10.0' (ffff8801d79ce0a8): fill_kobj_path: path = '/devices/pci0000:00/0000:00:01.0/0000:01:10.0'
[no free]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
0 files changed, 0 insertions, 0 deletions