CVE-2024-50213

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

drm/tests: hdmi: Fix memory leaks in drmdisplaymodefromcea_vic()

modprobe drmhdmistatehelpertest and then rmmod it, the following memory leak occurs.

The mode allocated in drmmodeduplicate() called by drmdisplaymodefromcea_vic() is not freed, which cause the memory leak:

unreferenced object 0xffffff80ccd18100 (size 128):
  comm "kunit_try_catch", pid 1851, jiffies 4295059695
  hex dump (first 32 bytes):
    57 62 00 00 80 02 90 02 f0 02 20 03 00 00 e0 01  Wb........ .....
    ea 01 ec 01 0d 02 00 00 0a 00 00 00 00 00 00 00  ................
  backtrace (crc c2f1aa95):
    [<000000000f10b11b>] kmemleak_alloc+0x34/0x40
    [<000000001cd4cf73>] __kmalloc_cache_noprof+0x26c/0x2f4
    [<00000000f1f3cffa>] drm_mode_duplicate+0x44/0x19c
    [<000000008cbeef13>] drm_display_mode_from_cea_vic+0x88/0x98
    [<0000000019daaacf>] 0xffffffedc11ae69c
    [<000000000aad0f85>] kunit_try_run_case+0x13c/0x3ac
    [<00000000a9210bac>] kunit_generic_run_threadfn_adapter+0x80/0xec
    [<000000000a0b2e9e>] kthread+0x2e8/0x374
    [<00000000bd668858>] ret_from_fork+0x10/0x20
......

Free mode by using drmkunitdisplaymodefromceavic() to fix it.