CVE-2022-50068

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

drm/ttm: Fix dummy res NULL ptr deref bug

Check the bo->resource value before accessing the resource mem_type.

v2: Fix commit description unwrapped warning

<log snip> [ 40.191227][ T184] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI [ 40.192995][ T184] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 40.194411][ T184] CPU: 1 PID: 184 Comm: systemd-udevd Not tainted 5.19.0-rc4-00721-gb297c22b7070 #1 [ 40.196063][ T184] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014 [ 40.199605][ T184] RIP: 0010:ttmbovalidate+0x1b3/0x240 [ttm] [ 40.200754][ T184] Code: e8 72 c5 ff ff 83 f8 b8 74 d4 85 c0 75 54 49 8b 9e 58 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 44 8b 53 10 31 c0 85 d2 0f 85 58 [ 40.203685][ T184] RSP: 0018:ffffc900006df0c8 EFLAGS: 00010202 [ 40.204630][ T184] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1102f4bb71b [ 40.205864][ T184] RDX: 0000000000000002 RSI: ffffc900006df208 RDI: 0000000000000010 [ 40.207102][ T184] RBP: 1ffff920000dbe1a R08: ffffc900006df208 R09: 0000000000000000 [ 40.208394][ T184] R10: ffff88817a5f0000 R11: 0000000000000001 R12: ffffc900006df110 [ 40.209692][ T184] R13: ffffc900006df0f0 R14: ffff88817a5db800 R15: ffffc900006df208 [ 40.210862][ T184] FS: 00007f6b1d16e8c0(0000) GS:ffff88839d700000(0000) knlGS:0000000000000000 [ 40.212250][ T184] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.213275][ T184] CR2: 000055a1001d4ff0 CR3: 00000001700f4000 CR4: 00000000000006e0 [ 40.214469][ T184] Call Trace: [ 40.214974][ T184] <TASK> [ 40.215438][ T184] ? ttmbobouncetempbuffer+0x140/0x140 [ttm] [ 40.216572][ T184] ? mutexspinonowner+0x240/0x240 [ 40.217456][ T184] ? drmvmaoffsetadd+0xaa/0x100 [drm] [ 40.218457][ T184] ttmboinitreserved+0x3d6/0x540 [ttm] [ 40.219410][ T184] ? shmemgetinode+0x744/0x980 [ 40.220231][ T184] ttmboinitvalidate+0xb1/0x200 [ttm] [ 40.221172][ T184] ? bodriverevictflags+0x340/0x340 [drmvramhelper] [ 40.222530][ T184] ? ttmboinitreserved+0x540/0x540 [ttm] [ 40.223643][ T184] ? _dosysfinitmodule+0x11a/0x1c0 [ 40.224654][ T184] ? _shmemfilesetup+0x102/0x280 [ 40.234764][ T184] drmgemvramcreate+0x305/0x480 [drmvramhelper] [ 40.235766][ T184] ? bodriverevictflags+0x340/0x340 [drmvramhelper] [ 40.236846][ T184] ? _kasanslabfree+0x108/0x180 [ 40.237650][ T184] drmgemvramfillcreatedumb+0x134/0x340 [drmvramhelper] [ 40.238864][ T184] ? localpciprobe+0xdf/0x180 [ 40.239674][ T184] ? drmmvramhelperinit+0x400/0x400 [drmvramhelper] [ 40.240826][ T184] drmclientframebuffercreate+0x19c/0x400 [drm] [ 40.241955][ T184] ? drmclientbufferdelete+0x200/0x200 [drm] [ 40.243001][ T184] ? drmclientpickcrtcs+0x554/0xb80 [drm] [ 40.244030][ T184] drmfbhelpergenericprobe+0x23f/0x940 [drmkmshelper] [ 40.245226][ T184] ? _condresched+0x1c/0xc0 [ 40.245987][ T184] ? drmfbhelpermemoryrangetoclip+0x180/0x180 [drmkmshelper] [ 40.247316][ T184] ? mutexunlock+0x80/0x100 [ 40.248005][ T184] ? _mutexunlockslowpath+0x2c0/0x2c0 [ 40.249083][ T184] drmfbhelpersinglefbprobe+0x907/0xf00 [drmkmshelper] [ 40.250314][ T184] ? drmfbhelpercheckvar+0x1180/0x1180 [drmkmshelper] [ 40.251540][ T184] ? _condresched+0x1c/0xc0 [ 40.252321][ T184] ? mutexlock+0x9f/0x100 [ 40.253062][ T184] _drmfbhelperinitialconfigandunlock+0xb9/0x2c0 [drmkmshelper] [ 40.254394][ T184] drmfbdevclienthotplug+0x56f/0x840 [drmkmshelper] [ 40.255477][ T184] drmfbdevgenericsetup+0x165/0x3c0 [drmkmshelper] [ 40.256607][ T184] bochspciprobe+0x6b7/0x900 [bochs] [
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