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| author | Yang Yingliang <yangyingliang@huawei.com> | 2022-11-08 16:40:02 +0300 |
|---|---|---|
| committer | Damien Le Moal <damien.lemoal@opensource.wdc.com> | 2022-11-11 11:26:02 +0300 |
| commit | 3613dbe3909dcc637fe6be00e4dc43b4aa0470ee (patch) | |
| tree | 352c5b7090048da5d70d56471cf5bc4dc29d276e /drivers/ata/libata-transport.c | |
| parent | 8c76310740807ade5ecdab5888f70ecb6d35732e (diff) | |
| download | linux-3613dbe3909dcc637fe6be00e4dc43b4aa0470ee.tar.xz | |
ata: libata-transport: fix error handling in ata_tport_add()
In ata_tport_add(), the return value of transport_add_device() is
not checked. As a result, it causes null-ptr-deref while removing
the module, because transport_remove_device() is called to remove
the device that was not added.
Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0
CPU: 12 PID: 13605 Comm: rmmod Kdump: loaded Tainted: G W 6.1.0-rc3+ #8
pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : device_del+0x48/0x39c
lr : device_del+0x44/0x39c
Call trace:
device_del+0x48/0x39c
attribute_container_class_device_del+0x28/0x40
transport_remove_classdev+0x60/0x7c
attribute_container_device_trigger+0x118/0x120
transport_remove_device+0x20/0x30
ata_tport_delete+0x34/0x60 [libata]
ata_port_detach+0x148/0x1b0 [libata]
ata_pci_remove_one+0x50/0x80 [libata]
ahci_remove_one+0x4c/0x8c [ahci]
Fix this by checking and handling return value of transport_add_device()
in ata_tport_add().
Fixes: d9027470b886 ("[libata] Add ATA transport class")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Diffstat (limited to 'drivers/ata/libata-transport.c')
| -rw-r--r-- | drivers/ata/libata-transport.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c index 105da3ec5eaa..ef53bdfbcbb2 100644 --- a/drivers/ata/libata-transport.c +++ b/drivers/ata/libata-transport.c @@ -301,7 +301,9 @@ int ata_tport_add(struct device *parent, pm_runtime_enable(dev); pm_runtime_forbid(dev); - transport_add_device(dev); + error = transport_add_device(dev); + if (error) + goto tport_transport_add_err; transport_configure_device(dev); error = ata_tlink_add(&ap->link); @@ -312,6 +314,7 @@ int ata_tport_add(struct device *parent, tport_link_err: transport_remove_device(dev); + tport_transport_add_err: device_del(dev); tport_err: |