diff options
| author | Julian Wiedmann <jwi@linux.vnet.ibm.com> | 2018-01-30 16:39:34 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-04-10 08:38:57 +0300 |
| commit | ab7efda477f976c22f1d35797c33f22612d93182 (patch) | |
| tree | d70314e81bc02653fa7b4ade9d241c1901d12af5 /drivers/s390 | |
| parent | 2c957a8ad45991f3ef71da5c75ed2299f3d46a31 (diff) | |
| download | linux-ab7efda477f976c22f1d35797c33f22612d93182.tar.xz | |
s390/ccwgroup: require at least one ccw device
ccwgroup_create_dev() derives the gdev's device name from gdev->cdev[0],
so make sure that this reference is valid.
For robustness only, all current ccwgroup drivers get this right.
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index bfec1485ca23..5535312602af 100644 --- a/drivers/s390/cio/ccwgroup.c +++ b/drivers/s390/cio/ccwgroup.c @@ -323,6 +323,9 @@ int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, struct ccw_dev_id dev_id; int rc, i; + if (num_devices < 1) + return -EINVAL; + gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]), GFP_KERNEL); if (!gdev) @@ -375,7 +378,7 @@ int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv, goto error; } /* Check if the devices are bound to the required ccw driver. */ - if (gdev->count && gdrv && gdrv->ccw_driver && + if (gdrv && gdrv->ccw_driver && gdev->cdev[0]->drv != gdrv->ccw_driver) { rc = -EINVAL; goto error; |