CVE-2022-50702

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

vdpasim: fix possible memory leak in vdpasimnetinit() and vdpasimblk_init()

Inject fault while probing module, if deviceregister() fails in vdpasimnetinit() or vdpasimblkinit(), but the refcount of kobject is not decreased to 0, the name allocated in devsetname() is leaked. Fix this by calling putdevice(), so that name can be freed in callback function kobject_cleanup().

(vdpasimnet) unreferenced object 0xffff88807eebc370 (size 16): comm "modprobe", pid 3848, jiffies 4362982860 (age 18.153s) hex dump (first 16 bytes): 76 64 70 61 73 69 6d 5f 6e 65 74 00 6b 6b 6b a5 vdpasim_net.kkk. backtrace: [<ffffffff8174f19e>] __kmallocnodetrackcaller+0x4e/0x150 [<ffffffff81731d53>] kstrdup+0x33/0x60 [<ffffffff83a5d421>] kobjectsetnamevargs+0x41/0x110 [<ffffffff82d87aab>] devsetname+0xab/0xe0 [<ffffffff82d91a23>] deviceadd+0xe3/0x1a80 [<ffffffffa0270013>] 0xffffffffa0270013 [<ffffffff81001c27>] dooneinitcall+0x87/0x2e0 [<ffffffff813739cb>] doinitmodule+0x1ab/0x640 [<ffffffff81379d20>] loadmodule+0x5d00/0x77f0 [<ffffffff8137bc40>] _dosysfinitmodule+0x110/0x1b0 [<ffffffff83c4d505>] dosyscall64+0x35/0x80 [<ffffffff83e0006a>] entrySYSCALL64afterhwframe+0x46/0xb0

(vdpasimblk) unreferenced object 0xffff8881070c1250 (size 16): comm "modprobe", pid 6844, jiffies 4364069319 (age 17.572s) hex dump (first 16 bytes): 76 64 70 61 73 69 6d 5f 62 6c 6b 00 6b 6b 6b a5 vdpasim_blk.kkk. backtrace: [<ffffffff8174f19e>] __kmallocnodetrackcaller+0x4e/0x150 [<ffffffff81731d53>] kstrdup+0x33/0x60 [<ffffffff83a5d421>] kobjectsetnamevargs+0x41/0x110 [<ffffffff82d87aab>] devsetname+0xab/0xe0 [<ffffffff82d91a23>] deviceadd+0xe3/0x1a80 [<ffffffffa0220013>] 0xffffffffa0220013 [<ffffffff81001c27>] dooneinitcall+0x87/0x2e0 [<ffffffff813739cb>] doinitmodule+0x1ab/0x640 [<ffffffff81379d20>] loadmodule+0x5d00/0x77f0 [<ffffffff8137bc40>] _dosysfinitmodule+0x110/0x1b0 [<ffffffff83c4d505>] dosyscall64+0x35/0x80 [<ffffffff83e0006a>] entrySYSCALL64afterhwframe+0x46/0xb0