program syz-executor4 not setting count and/or reply_len properly ================================================================== BUG: KASAN: wild-memory-access on address ffe708746e2ab000 Read of size 201 by task syz-executor4/4556 CPU: 0 PID: 4556 Comm: syz-executor4 Not tainted 4.9.54-ge5eba30 #61 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801a86bfae8 ffffffff81d93659 ffe708746e2ab000 00000000000000c9 0000000000000000 ffff8801a67edde0 ffe708746e2ab000 ffff8801a86bfb70 ffffffff8153d48f 0000000000000000 0000000000000001 ffffffff826651bb Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] kasan_report_error mm/kasan/report.c:284 [inline] [] kasan_report.part.1+0x40f/0x500 mm/kasan/report.c:309 [] kasan_report+0x20/0x30 mm/kasan/report.c:296 [] check_memory_region_inline mm/kasan/kasan.c:308 [inline] [] check_memory_region+0x137/0x190 mm/kasan/kasan.c:315 [] kasan_check_read+0x11/0x20 mm/kasan/kasan.c:320 [] __copy_to_user arch/x86/include/asm/uaccess_64.h:182 [inline] [] sg_read_oxfer drivers/scsi/sg.c:1978 [inline] [] sg_read+0x124b/0x1400 drivers/scsi/sg.c:520 [] __vfs_read+0x103/0x670 fs/read_write.c:452 [] vfs_read+0x107/0x330 fs/read_write.c:475 [] SYSC_read fs/read_write.c:591 [inline] [] SyS_read+0xd9/0x1b0 fs/read_write.c:584 [] entry_SYSCALL_64_fastpath+0x23/0xc6 ================================================================== sg_write: data in/out 392925/816 bytes for SCSI command 0x0-- guessing data in; program syz-executor4 not setting count and/or reply_len properly kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4559 Comm: syz-executor4 Tainted: G B 4.9.54-ge5eba30 #61 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801a66c1800 task.stack: ffff8801a5ef0000 RIP: 0010:[] [] sg_read_oxfer drivers/scsi/sg.c:1976 [inline] RIP: 0010:[] [] sg_read+0xcc1/0x1400 drivers/scsi/sg.c:520 RSP: 0018:ffff8801a5ef7bc0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90002272000 RDX: 0000000000000000 RSI: 00000000000000c9 RDI: ffff8801a5e82270 RBP: ffff8801a5ef7cd0 R08: 0000000000000000 R09: ffffed0034cfdbe5 R10: 0000000000000005 R11: ffffed0034cfdbe4 R12: 0000000000001000 R13: 0000000000000000 R14: ffff8801a67edf00 R15: ffff8801a5e82240 FS: 00007fcf6f0a8700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020600000 CR3: 00000001cb4c0000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000000 ffffffffffffffda ffff8801a5e82258 ffff8801000000c9 ffff8801a5ef7e38 ffff8801a5e82268 00000000000000ed 00000000ffffffff ffff8801d1b8aa00 1ffff10034bdef84 0000000020508f13 0000000020508f37 Call Trace: [] __vfs_read+0x103/0x670 fs/read_write.c:452 [] vfs_read+0x107/0x330 fs/read_write.c:475 [] SYSC_read fs/read_write.c:591 [inline] [] SyS_read+0xd9/0x1b0 fs/read_write.c:584 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 19 07 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 ed 06 00 00 48 8b 1b 48 85 db 0f 84 51 03 00 RIP [] sg_read_oxfer drivers/scsi/sg.c:1976 [inline] RIP [] sg_read+0xcc1/0x1400 drivers/scsi/sg.c:520 RSP ---[ end trace fac412b18e95189e ]---