R13: 00007fff1918d43f R14: 00007fc0b15ce9c0 R15: 000000000078bf0c general protection fault, probably for non-canonical address 0xdffffc0000000017: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000b8-0x00000000000000bf] CPU: 1 PID: 9268 Comm: syz-executor.0 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dma_buf_release+0x51/0x3f0 drivers/dma-buf/dma-buf.c:63 Code: 03 80 3c 02 00 0f 85 30 03 00 00 48 8b ad e8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd b8 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e3 02 00 00 8b 9d b8 00 00 00 RSP: 0018:ffffc90004c87aa0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffffffff847bf7e0 RCX: ffffc90001cf9000 RDX: 0000000000000017 RSI: ffffffff847bf7f0 RDI: 00000000000000b8 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88805090e28b R10: 0000000000000000 R11: 0000000000000000 R12: ffff888086571c80 R13: ffff888086571c08 R14: ffff888086571c50 R15: 0000000000000000 FS: 00007fc0b15ce700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000768000 CR3: 0000000087ee5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dentry_kill+0x42b/0x640 fs/dcache.c:584 dentry_kill fs/dcache.c:705 [inline] dput+0x725/0xbc0 fs/dcache.c:878 path_put+0x2d/0x60 fs/namei.c:496 alloc_file_pseudo+0x20d/0x250 fs/file_table.c:236 dma_buf_getfile drivers/dma-buf/dma-buf.c:441 [inline] dma_buf_export+0x5f7/0xb00 drivers/dma-buf/dma-buf.c:558 udmabuf_create+0xb9d/0xe30 drivers/dma-buf/udmabuf.c:228 udmabuf_ioctl_create_list drivers/dma-buf/udmabuf.c:284 [inline] udmabuf_ioctl+0x265/0x2c0 drivers/dma-buf/udmabuf.c:299 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c369 Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc0b15cdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000018bc0 RCX: 000000000045c369 RDX: 0000000020000280 RSI: 0000000040087543 RDI: 0000000000000003 RBP: 00007fc0b15cdca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 R13: 00007fff1918d43f R14: 00007fc0b15ce9c0 R15: 000000000078bf0c Modules linked in: ---[ end trace 3c78feeacb4fc86d ]--- RIP: 0010:dma_buf_release+0x51/0x3f0 drivers/dma-buf/dma-buf.c:63 Code: 03 80 3c 02 00 0f 85 30 03 00 00 48 8b ad e8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bd b8 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e3 02 00 00 8b 9d b8 00 00 00 RSP: 0018:ffffc90004c87aa0 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffffffff847bf7e0 RCX: ffffc90001cf9000 RDX: 0000000000000017 RSI: ffffffff847bf7f0 RDI: 00000000000000b8 RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88805090e28b R10: 0000000000000000 R11: 0000000000000000 R12: ffff888086571c80 R13: ffff888086571c08 R14: ffff888086571c50 R15: 0000000000000000 FS: 00007fc0b15ce700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000744694 CR3: 0000000087ee5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400