Hi Greg, On Fri 28.Aug'20 at 12:27:38 +0200, Greg Kroah-Hartman wrote:
On Tue, Aug 25, 2020 at 10:45:06AM +0800, [email protected] wrote:+ default: + pr_warn("Unknown IOCTL 0x%x!\n", cmd); + ret = -EINVAL;Wrong error value here, right?
Right, it should be -ENOIOCTLCMD. However, i found many instances in kernel drivers return -EINVAL for no ioctl command support. :)
And you just made a simple way to cause a DoS on the kernel log :(
Oh, let me remove the warn log. Thanks shuo
