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EDAC, i7core: Fix memleaks and use-after-free on probe and remove

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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@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac <linux-edac@vger.kernel.org>
Fixes: 356f0a3086 ("i7core_edac: change the mem allocation scheme to make Documentation/kobject.txt happy")
Link: http://lkml.kernel.org/r/20180612124335.6420-2-johan@kernel.org
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Johan Hovold 2018-06-12 14:43:35 +02:00 committed by Borislav Petkov
parent 4708aa85d5
commit 6c974d4dfa
1 changed files with 15 additions and 7 deletions
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22
drivers/edac/i7core_edac.c
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@ -1177,15 +1177,14 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
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;
@ -1199,9 +1198,18 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
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)
@ -1211,11 +1219,11 @@ static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci)
edac_dbg(1, "\n");
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);
}
/****************************************************************************