diff options
| author | Yang Yingliang <yangyingliang@huawei.com> | 2022-11-08 21:40:03 +0800 |
|---|---|---|
| committer | Damien Le Moal <damien.lemoal@opensource.wdc.com> | 2022-11-11 17:26:03 +0900 |
| commit | cf0816f6322c5c37ee52655f928e91ecf32da103 (patch) | |
| tree | dbdc64bc7be5de04ae6ae2cc8efdb4e92d00f80d | |
| parent | 3613dbe3909dcc637fe6be00e4dc43b4aa0470ee (diff) | |
ata: libata-transport: fix error handling in ata_tlink_add()
In ata_tlink_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: 33 PID: 13850 Comm: rmmod Kdump: loaded Tainted: G W 6.1.0-rc3+ #12
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_tlink_delete+0x88/0xb0 [libata]
ata_tport_delete+0x2c/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_tlink_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>
| -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 ef53bdfbcbb2..aac9336e8153 100644 --- a/drivers/ata/libata-transport.c +++ b/drivers/ata/libata-transport.c @@ -458,7 +458,9 @@ int ata_tlink_add(struct ata_link *link) goto tlink_err; } - transport_add_device(dev); + error = transport_add_device(dev); + if (error) + goto tlink_transport_err; transport_configure_device(dev); ata_for_each_dev(ata_dev, link, ALL) { @@ -473,6 +475,7 @@ int ata_tlink_add(struct ata_link *link) ata_tdev_delete(ata_dev); } transport_remove_device(dev); + tlink_transport_err: device_del(dev); tlink_err: transport_destroy_device(dev); |