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

cachefiles: fix memory leak in cachefiles_add_cache()

The following memory leak was reported after unbinding /dev/cachefiles:

==================================================================
unreferenced object 0xffff9b674176e3c0 (size 192):
  comm "cachefilesd2", pid 680, jiffies 4294881224
  hex dump (first 32 bytes):
    01 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 ea38a44b):
    [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370
    [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0
    [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120
    [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0
    [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0
    [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520
    [<ffffffff8ebc5069>] ksys_write+0x69/0xf0
    [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140
    [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76
==================================================================

Put the reference count of cache_cred in cachefiles_daemon_unbind() to
fix the problem. And also put cache_cred in cachefiles_add_cache() error
branch to avoid memory leaks.

kernel.org https://git.kernel.org/stable/c/037d5a949b0455540ef9aab34c10ddf54b65d285 [No types assigned]

kernel.org https://git.kernel.org/stable/c/38e921616320d159336b0ffadb09e9fb4945c7c3 [No types assigned]

kernel.org https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8 [No types assigned]

kernel.org https://git.kernel.org/stable/c/8b218e2f0a27a9f09428b1847b4580640b9d1e58 [No types assigned]

kernel.org https://git.kernel.org/stable/c/94965be37add0983672e48ecb33cdbda92b62579 [No types assigned]

kernel.org https://git.kernel.org/stable/c/9cac69912052a4def571fedf1cb9bb4ec590e25a [No types assigned]

kernel.org https://git.kernel.org/stable/c/cb5466783793e66272624cf71925ae1d1ba32083 [No types assigned]

kernel.org https://git.kernel.org/stable/c/e21a2f17566cbd64926fb8f16323972f7a064444 [No types assigned]