CVE-2023-53271

In the Linux kernel, the following vulnerability has been resolved:

ubi: Fix unreferenced object reported by kmemleak in ubi_resize_volume()

There is a memory leaks problem reported by kmemleak:

unreferenced object 0xffff888102007a00 (size 128): comm ubirsvol, pid 32090, jiffies 4298464136 (age 2361.231s) hex dump (first 32 bytes): ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ……………. ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ……………. backtrace: [] __kmalloc+0x4d/0x150 [] ubi_eba_create_table+0x76/0x170 [ubi] [] ubi_resize_volume+0x1be/0xbc0 [ubi] [] ubi_cdev_ioctl+0x701/0x1850 [ubi] [] __x64_sys_ioctl+0x11d/0x170 [] do_syscall_64+0x35/0x80 [] entry_SYSCALL_64_after_hwframe+0x46/0xb0

This is due to a mismatch between create and destroy interfaces, and in detail that new_eba_tbl created by ubi_eba_create_table() but destroyed by kfree(), while will causing new_eba_tbl->entries not freed.

Fix it by replacing kfree(new_eba_tbl) with ubi_eba_destroy_table(new_eba_tbl)

Affected Software

References

• https://git.kernel.org/stable/c/07b60f7452d2fa731737552937cb81821919f874
• https://git.kernel.org/stable/c/09780a44093b53f9cbca76246af2e4ff0884e512
• https://git.kernel.org/stable/c/1e591ea072df7211f64542a09482b5f81cb3ad27
• https://git.kernel.org/stable/c/26ec2d66aecab8ff997b912c20247fedba4f5740
• https://git.kernel.org/stable/c/27b760b81951d8d5e5c952a696af8574052b0709
• https://git.kernel.org/stable/c/31d60afe2cc2b712dbefcaab6b7d6a47036f844e
• https://git.kernel.org/stable/c/5c0c81a313492b83bd0c038b8839b0e04eb87563
• https://git.kernel.org/stable/c/95a72417dd13ebcdcb1bd0c5d4d15f7c5bfbb288