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dm init: Handle minors larger than 255

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dm_parse_device_entry() simply copies the minor number into dmi.dev, but
the dev_t format splits the minor number between the lowest 8 bytes and
highest 12 bytes. If the minor number is larger than 255, part of it
will end up getting treated as the major number

Fix this by checking that the minor number is valid and then encoding it
as a dev_t.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Benjamin Marzinski 2024-07-02 12:13:24 +02:00 committed by Mikulas Patocka
parent c1a66a37d6
commit 140ce37fd7
1 changed files with 3 additions and 1 deletions
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4
drivers/md/dm-init.c
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@ -212,8 +212,10 @@ static char __init *dm_parse_device_entry(struct dm_device *dev, char *str)
strscpy(dev->dmi.uuid, field[1], sizeof(dev->dmi.uuid));
/* minor */
if (strlen(field[2])) {
if (kstrtoull(field[2], 0, &dev->dmi.dev))
if (kstrtoull(field[2], 0, &dev->dmi.dev) ||
dev->dmi.dev >= (1 << MINORBITS))
return ERR_PTR(-EINVAL);
dev->dmi.dev = huge_encode_dev((dev_t)dev->dmi.dev);
dev->dmi.flags |= DM_PERSISTENT_DEV_FLAG;
}
/* flags */