CVE-2021-47455 in Linux
الملخص
بحسب MITRE • 22/05/2024
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().
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