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| author | Dan Williams <dan.j.williams@intel.com> | 2017-07-12 13:42:37 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-07-17 11:43:58 -0700 |
| commit | 43fe51e11c194a6576634585f81ba33e104194a5 (patch) | |
| tree | cf27724a7c3a0c200e167068d1e2346dedbc5c52 /drivers/dax/device.c | |
| parent | 4e3f0701f25ab194c5362576b1146a1e6cc6c2e7 (diff) | |
| download | linux-43fe51e11c194a6576634585f81ba33e104194a5.tar.bz2 | |
device-dax: fix 'passing zero to ERR_PTR()' warning
Dan Carpenter reports:
The patch 7b6be8444e0f: "dax: refactor dax-fs into a generic provider
of 'struct dax_device' instances" from Apr 11, 2017, leads to the
following static checker warning:
drivers/dax/device.c:643 devm_create_dev_dax()
warn: passing zero to 'ERR_PTR'
Fix the case where we inadvertently leak 0 to ERR_PTR() by setting at
every error case, and make it clear that 'count' is never 0.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/device.c')
| -rw-r--r-- | drivers/dax/device.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index 12943d19bfc4..44d72e5e64cc 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -567,7 +567,10 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, struct inode *inode; struct device *dev; struct cdev *cdev; - int rc = 0, i; + int rc, i; + + if (!count) + return ERR_PTR(-EINVAL); dev_dax = kzalloc(sizeof(*dev_dax) + sizeof(*res) * count, GFP_KERNEL); if (!dev_dax) @@ -598,8 +601,10 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, * device outside of mmap of the resulting character device. */ dax_dev = alloc_dax(dev_dax, NULL, NULL); - if (!dax_dev) + if (!dax_dev) { + rc = -ENOMEM; goto err_dax; + } /* from here on we're committed to teardown via dax_dev_release() */ dev = &dev_dax->dev; |