CVE-2024-50068

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

mm/damon/tests/sysfs-kunit.h: fix memory leak in damon_sysfs_test_add_targets()

The sysfs_target->regions allocated in damon_sysfs_regions_alloc() is not freed in damon_sysfs_test_add_targets(), which cause the following memory leak, free it to fix it.

unreferenced object 0xffffff80c2a8db80 (size 96):
  comm kunit_try_catch, pid 187, jiffies 4294894363
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 0):
    [<0000000001e3714d>] kmemleak_alloc+0x34/0x40
    [<000000008e6835c1>] __kmalloc_cache_noprof+0x26c/0x2f4
    [<000000001286d9f8>] damon_sysfs_test_add_targets+0x1cc/0x738
    [<0000000032ef8f77>] kunit_try_run_case+0x13c/0x3ac
    [<00000000f3edea23>] kunit_generic_run_threadfn_adapter+0x80/0xec
    [<00000000adf936cf>] kthread+0x2e8/0x374
    [<0000000041bb1628>] ret_from_fork+0x10/0x20

Weakness

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• https://git.kernel.org/stable/c/05d43455f6bffa6abc7b937ca58be00452e6973f
• https://git.kernel.org/stable/c/2d6a1c835685de3b0c8e8dc871f60f4ef92ab01a