CVE-2021-47455 Information

Description

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: [<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0 [<0000000079f6e2ff>] kvasprintf+0xb5/0x150 [<0000000026aae54f>] kvasprintf_const+0x60/0x190 [<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150 [<000000004e35abdd>] dev_set_name+0xc0/0x100 [<00000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp] [<000000008bb9f0de>] 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().

Reference

https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8 https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0