CVE-2021-47455

In the Linux kernel, the following vulnerability has been resolved: ptp: Fix possible memory leak in ptp_clock_register() I got memory leak as follows when doing fault injection test: unreferenced object 0xffff88800906c618 (size 8): comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (age 13.188s) hex dump (first 8 bytes): 70 74 70 30 00 00 00 00 ptp0.... backtrace: [ ] __kmalloc_track_caller+0x19f/0x3a0 [ ] kvasprintf+0xb5/0x150 [ ] kvasprintf_const+0x60/0x190 [ ] kobject_set_name_vargs+0x56/0x150 [ ] dev_set_name+0xc0/0x100 [ ] ptp_clock_register+0x9f4/0xd30 [ptp] [ ] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] When posix_clock_register() returns an error, the name allocated in dev_set_name() will be leaked, the put_device() should be used to give up the device reference, then the name will be freed in kobject_cleanup() and other memory will be freed in ptp_clock_release().