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platform/chrome: Fix for double-fetched ioctl args

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A single fix this time, closing a window where ioctl args are fetched twice.
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Merge tag 'chrome-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/olof/chrome-platform

Pull chrome platform fix from Olof Johansson:
 "A single fix this time, closing a window where ioctl args are fetched
  twice"

* tag 'chrome-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/olof/chrome-platform:
  platform/chrome: cros_ec_dev - double fetch bug in ioctl
This commit is contained in:
Linus Torvalds 2016-07-06 09:07:23 -07:00
commit 4d0a279c7c
1 changed files with 7 additions and 1 deletions
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8
drivers/platform/chrome/cros_ec_dev.c
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@ -151,13 +151,19 @@ static long ec_device_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
goto exit;
}
if (u_cmd.outsize != s_cmd->outsize ||
u_cmd.insize != s_cmd->insize) {
ret = -EINVAL;
goto exit;
}
s_cmd->command += ec->cmd_offset;
ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
/* Only copy data to userland if data was received. */
if (ret < 0)
goto exit;
if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + u_cmd.insize))
if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + s_cmd->insize))
ret = -EFAULT;
exit:
kfree(s_cmd);