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greybus: bundle: use kstrdup() for state file 

The kernfs code guarantees we'll get a NUL-terminated buffer.
Use kstrdup() rather than kzalloc() + memcpy() in state_store()
making it slightly clearer what we're doing.  This has the added
benefit of guaranteeing that the stored string has no NUL character
inside it.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Alex Elder 2015-04-17 14:41:47 -05:00 committed by Greg Kroah-Hartman
parent 55b930cd17
commit 22fd2a8ade
1 changed files with 1 additions and 3 deletions
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4
drivers/staging/greybus/bundle.c
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@ -48,12 +48,10 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
struct gb_bundle *bundle = to_gb_bundle(dev);
kfree(bundle->state);
bundle->state = kzalloc(size + 1, GFP_KERNEL);
bundle->state = kstrdup(buf, GFP_KERNEL);
if (!bundle->state)
return -ENOMEM;
memcpy(bundle->state, buf, size);
/* Tell userspace that the file contents changed */
sysfs_notify(&bundle->dev.kobj, NULL, "state");