syzbot has found a reproducer for the following issue on: HEAD commit: f8fbb47c6e86 Merge branch 'for-v5.14' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11d1a779300000 kernel config: https://syzkaller.appspot.com/x/.config?x=171d57d5a48c8cad dashboard link: https://syzkaller.appspot.com/bug?extid=66e3ea42c4b176748b9c compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b8db9e300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c21581300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+66e3ea42c4b176748b9c@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 58 Comm: kworker/u4:3 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: pencrypt_parallel padata_parallel_worker RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:68 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:88 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:77 [inline] RIP: 0010:scatterwalk_copychunks+0x4db/0x6a0 crypto/scatterwalk.c:50 Code: ff df 80 3c 02 00 0f 85 b4 01 00 00 49 8d 44 24 08 4d 89 26 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 77 01 00 00 48 b8 00 00 00 00 RSP: 0018:ffffc900011d7628 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff83d3dc23 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88801903a69b R10: ffffffff83d3dbd3 R11: 0000000000086088 R12: 0000000000000000 R13: 0000000000000001 R14: ffffc900011d7888 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000100 CR3: 000000001d355000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skcipher_next_slow crypto/skcipher.c:278 [inline] skcipher_walk_next+0x7af/0x1680 crypto/skcipher.c:363 skcipher_walk_first+0xf8/0x3c0 crypto/skcipher.c:446 skcipher_walk_aead_common+0x7a5/0xbc0 crypto/skcipher.c:539 gcmaes_crypt_by_sg+0x31d/0x890 arch/x86/crypto/aesni-intel_glue.c:658 gcmaes_encrypt+0xe2/0x230 arch/x86/crypto/aesni-intel_glue.c:722 generic_gcmaes_encrypt+0x12e/0x190 arch/x86/crypto/aesni-intel_glue.c:1071 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82 padata_parallel_worker+0x60/0xb0 kernel/padata.c:157 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 process_scheduled_works kernel/workqueue.c:2338 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2424 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace d7f7427ae496b704 ]--- RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:68 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:88 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:77 [inline] RIP: 0010:scatterwalk_copychunks+0x4db/0x6a0 crypto/scatterwalk.c:50 Code: ff df 80 3c 02 00 0f 85 b4 01 00 00 49 8d 44 24 08 4d 89 26 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 77 01 00 00 48 b8 00 00 00 00 RSP: 0018:ffffc900011d7628 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff83d3dc23 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88801903a69b R10: ffffffff83d3dbd3 R11: 0000000000086088 R12: 0000000000000000 R13: 0000000000000001 R14: ffffc900011d7888 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000100 CR3: 000000000b68e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 80 3c 02 00 0f filds 0xf00023c(%rax) 6: 85 b4 01 00 00 49 8d test %esi,-0x72b70000(%rcx,%rax,1) d: 44 24 08 rex.R and $0x8,%al 10: 4d 89 26 mov %r12,(%r14) 13: 48 89 c2 mov %rax,%rdx 16: 48 89 44 24 18 mov %rax,0x18(%rsp) 1b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 22: fc ff df 25: 48 c1 ea 03 shr $0x3,%rdx 29: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2d: 84 c0 test %al,%al 2f: 74 08 je 0x39 31: 3c 03 cmp $0x3,%al 33: 0f 8e 77 01 00 00 jle 0x1b0 39: 48 rex.W 3a: b8 00 00 00 00 mov $0x0,%eax
