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authorYang Yingliang <yangyingliang@huawei.com>2022-11-08 21:40:02 +0800
committerDamien Le Moal <damien.lemoal@opensource.wdc.com>2022-11-11 17:26:02 +0900
commit3613dbe3909dcc637fe6be00e4dc43b4aa0470ee (patch)
tree352c5b7090048da5d70d56471cf5bc4dc29d276e /drivers/ata/libata-transport.c
parent8c76310740807ade5ecdab5888f70ecb6d35732e (diff)
downloadlinux-3613dbe3909dcc637fe6be00e4dc43b4aa0470ee.tar.bz2
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.c5
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: