CVE-2021-47455

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