3.16.62-rc1 review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@xxxxxxxxxx>
commit 6c974d4dfafe5e9ee754f2a6fba0eb1864f1649e upstream.
Make sure to free and deregister the addrmatch and chancounts devices
allocated during probe in all error paths. Also fix use-after-free in a
probe error path and in the remove success path where the devices were
being put before before deregistration.
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: linux-edac <linux-edac@xxxxxxxxxxxxxxx>
Fixes: 356f0a30860d ("i7core_edac: change the mem allocation scheme to make Documentation/kobject.txt happy")
Link: http://lkml.kernel.org/r/20180612124335.6420-2-johan@xxxxxxxxxx
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/edac/i7core_edac.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1190,15 +1190,14 @@ static int i7core_create_sysfs_devices(s
rc = device_add(pvt->addrmatch_dev);
if (rc < 0)
- return rc;
+ goto err_put_addrmatch;
if (!pvt->is_registered) {
pvt->chancounts_dev = kzalloc(sizeof(*pvt->chancounts_dev),
GFP_KERNEL);
if (!pvt->chancounts_dev) {
- put_device(pvt->addrmatch_dev);
- device_del(pvt->addrmatch_dev);
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto err_del_addrmatch;
}
pvt->chancounts_dev->type = &all_channel_counts_type;
@@ -1212,9 +1211,18 @@ static int i7core_create_sysfs_devices(s
rc = device_add(pvt->chancounts_dev);
if (rc < 0)
- return rc;
+ goto err_put_chancounts;
}
return 0;
+
+err_put_chancounts:
+ put_device(pvt->chancounts_dev);
+err_del_addrmatch:
+ device_del(pvt->addrmatch_dev);
+err_put_addrmatch:
+ put_device(pvt->addrmatch_dev);
+
+ return rc;
}
static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci)
@@ -1229,11 +1237,11 @@ static void i7core_delete_sysfs_devices(
device_remove_file(&mci->dev, &dev_attr_inject_enable);
if (!pvt->is_registered) {
- put_device(pvt->chancounts_dev);
device_del(pvt->chancounts_dev);
+ put_device(pvt->chancounts_dev);
}
- put_device(pvt->addrmatch_dev);
device_del(pvt->addrmatch_dev);
+ put_device(pvt->addrmatch_dev);
}
/****************************************************************************
