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

cachefiles: fix memory leak in cachefilesaddcache()

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>] kmemcachealloc+0x2d5/0x370 [<ffffffff8e917f86>] preparecreds+0x26/0x2e0 [<ffffffffc002eeef>] cachefilesdeterminecachesecurity+0x1f/0x120 [<ffffffffc00243ec>] cachefilesaddcache+0x13c/0x3a0 [<ffffffffc0025216>] cachefilesdaemonwrite+0x146/0x1c0 [<ffffffff8ebc4a3b>] vfswrite+0xcb/0x520 [<ffffffff8ebc5069>] ksyswrite+0x69/0xf0 [<ffffffff8f6d4662>] dosyscall64+0x72/0x140

[<ffffffff8f8000aa>] entrySYSCALL64afterhwframe+0x6e/0x76

Put the reference count of cachecred in cachefilesdaemonunbind() to fix the problem. And also put cachecred in cachefilesaddcache() error branch to avoid memory leaks.