CVE-2024-26728

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

drm/amd/display: fix null-pointer dereference on edid reading

Use i2c adapter when there isn't auxmode in dclink to fix a null-pointer derefence that happens when running igt@kmsforceconnector_basic in a system with DCN2.1 and HDMI connector detected as below:

[ +0.178146] BUG: kernel NULL pointer dereference, address: 00000000000004c0 [ +0.000010] #PF: supervisor read access in kernel mode [ +0.000005] #PF: errorcode(0x0000) - not-present page [ +0.000004] PGD 0 P4D 0 [ +0.000006] Oops: 0000 [#1] PREEMPT SMP NOPTI [ +0.000006] CPU: 15 PID: 2368 Comm: kmsforceconne Not tainted 6.5.0-asdn+ #152 [ +0.000005] Hardware name: HP HP ENVY x360 Convertible 13-ay1xxx/8929, BIOS F.01 07/14/2021 [ +0.000004] RIP: 0010:i2ctransfer+0xd/0x100 [ +0.000011] Code: ea fc ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 54 55 53 <48> 8b 47 10 48 89 fb 48 83 38 00 0f 84 b3 00 00 00 83 3d 2f 80 16 [ +0.000004] RSP: 0018:ffff9c4f89c0fad0 EFLAGS: 00010246 [ +0.000005] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000080 [ +0.000003] RDX: 0000000000000002 RSI: ffff9c4f89c0fb20 RDI: 00000000000004b0 [ +0.000003] RBP: ffff9c4f89c0fb80 R08: 0000000000000080 R09: ffff8d8e0b15b980 [ +0.000003] R10: 00000000000380e0 R11: 0000000000000000 R12: 0000000000000080 [ +0.000002] R13: 0000000000000002 R14: ffff9c4f89c0fb0e R15: ffff9c4f89c0fb0f [ +0.000004] FS: 00007f9ad2176c40(0000) GS:ffff8d90fe9c0000(0000) knlGS:0000000000000000 [ +0.000003] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ +0.000004] CR2: 00000000000004c0 CR3: 0000000121bc4000 CR4: 0000000000750ee0 [ +0.000003] PKRU: 55555554 [ +0.000003] Call Trace: [ +0.000006] <TASK> [ +0.000006] ? _die+0x23/0x70 [ +0.000011] ? pagefaultoops+0x17d/0x4c0 [ +0.000008] ? preemptcountadd+0x6e/0xa0 [ +0.000008] ? srsoaliasreturnthunk+0x5/0x7f [ +0.000011] ? excpagefault+0x7f/0x180 [ +0.000009] ? asmexcpagefault+0x26/0x30 [ +0.000013] ? i2ctransfer+0xd/0x100 [ +0.000010] drmdoprobeddcedid+0xc2/0x140 [drm] [ +0.000067] ? srsoaliasreturnthunk+0x5/0x7f [ +0.000006] ? _drmdogetedid+0x97/0x3c0 [drm] [ +0.000043] ? _pfxdrmdoprobeddcedid+0x10/0x10 [drm] [ +0.000042] edidblockread+0x3b/0xd0 [drm] [ +0.000043] drmdogetedid+0xb6/0x3c0 [drm] [ +0.000041] ? _pfxdrmdoprobeddcedid+0x10/0x10 [drm] [ +0.000043] drmedidreadcustom+0x37/0xd0 [drm] [ +0.000044] amdgpudmconnectormodevalid+0x129/0x1d0 [amdgpu] [ +0.000153] drmconnectormodevalid+0x3b/0x60 [drmkmshelper] [ +0.000000] _drmhelperupdateandvalidate+0xfe/0x3c0 [drmkmshelper] [ +0.000000] ? amdgpudmconnectorgetmodes+0xb6/0x520 [amdgpu] [ +0.000000] ? srsoaliasreturnthunk+0x5/0x7f [ +0.000000] drmhelperprobesingleconnectormodes+0x2ab/0x540 [drmkmshelper] [ +0.000000] statusstore+0xb2/0x1f0 [drm] [ +0.000000] kernfsfopwriteiter+0x136/0x1d0 [ +0.000000] vfswrite+0x24d/0x440 [ +0.000000] ksyswrite+0x6f/0xf0 [ +0.000000] dosyscall64+0x60/0xc0 [ +0.000000] ? srsoaliasreturnthunk+0x5/0x7f [ +0.000000] ? syscallexittousermode+0x2b/0x40 [ +0.000000] ? srsoaliasreturnthunk+0x5/0x7f [ +0.000000] ? dosyscall64+0x6c/0xc0 [ +0.000000] ? dosyscall64+0x6c/0xc0 [ +0.000000] entrySYSCALL64afterhwframe+0x6e/0xd8 [ +0.000000] RIP: 0033:0x7f9ad46b4b00 [ +0.000000] Code: 40 00 48 8b 15 19 b3 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 80 3d e1 3a 0e 00 00 74 17 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 28 48 89 [ +0.000000] RSP: 002b:00007ffcbd3bd6d8 EFLAGS: 00000202 ORIGRAX: 0000000000000001 [ +0.000000] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ad46b4b00 [ +0.000000] RDX: 0000000000000002 RSI: 00007f9ad48a7417 RDI: 0000000000000009 [ +0.000000] RBP: 0000000000000002 R08 ---truncated---