RBP: 00007f4a012adca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 R13: 00007ffff4ba918f R14: 00007f4a012ae9c0 R15: 000000000118bf2c 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: 18217 Comm: syz-executor.5 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dma_buf_release+0x4b/0x310 drivers/dma-buf/dma-buf.c:63 Code: 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 77 b3 19 fd 4c 8b 23 49 8d 9c 24 b8 00 00 00 48 89 d8 48 c1 e8 03 <42> 8a 04 28 84 c0 0f 85 4b 02 00 00 8b 1b 31 ff 89 de e8 7e 11 da RSP: 0018:ffffc90015fb7bf0 EFLAGS: 00010206 RAX: 0000000000000017 RBX: 00000000000000b8 RCX: 0000000000040000 RDX: ffffc900132e1000 RSI: 0000000000035f93 RDI: 0000000000035f94 RBP: 1ffff11010d39e8a R08: ffffffff81c52cf0 R09: ffffed10096da0f2 R10: ffffed10096da0f2 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 1ffff11010d39eaa R15: ffff8880869cf4d8 FS: 00007f4a012ae700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000118c000 CR3: 00000000881f7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __dentry_kill+0x43f/0x5d0 fs/dcache.c:584 dentry_kill fs/dcache.c:692 [inline] dput+0x45e/0x710 fs/dcache.c:878 path_put+0x35/0x60 fs/namei.c:496 alloc_file_pseudo+0x1d2/0x240 fs/file_table.c:236 dma_buf_getfile drivers/dma-buf/dma-buf.c:441 [inline] dma_buf_export+0x5d7/0x970 drivers/dma-buf/dma-buf.c:558 udmabuf_create+0x6e4/0xb40 drivers/dma-buf/udmabuf.c:228 udmabuf_ioctl_create_list drivers/dma-buf/udmabuf.c:284 [inline] udmabuf_ioctl+0x295/0x360 drivers/dma-buf/udmabuf.c:299 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ce69 Code: 2d 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4a012adc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000019500 RCX: 000000000045ce69 RDX: 0000000020000180 RSI: 0000000040087543 RDI: 0000000000000003 RBP: 00007f4a012adca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008 R13: 00007ffff4ba918f R14: 00007f4a012ae9c0 R15: 000000000118bf2c Modules linked in: ---[ end trace 0a33c194c30b81d1 ]--- RIP: 0010:dma_buf_release+0x4b/0x310 drivers/dma-buf/dma-buf.c:63 Code: 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 77 b3 19 fd 4c 8b 23 49 8d 9c 24 b8 00 00 00 48 89 d8 48 c1 e8 03 <42> 8a 04 28 84 c0 0f 85 4b 02 00 00 8b 1b 31 ff 89 de e8 7e 11 da RSP: 0018:ffffc90015fb7bf0 EFLAGS: 00010206 RAX: 0000000000000017 RBX: 00000000000000b8 RCX: 0000000000040000 RDX: ffffc900132e1000 RSI: 0000000000035f93 RDI: 0000000000035f94 RBP: 1ffff11010d39e8a R08: ffffffff81c52cf0 R09: ffffed10096da0f2 R10: ffffed10096da0f2 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 1ffff11010d39eaa R15: ffff8880869cf4d8 FS: 00007f4a012ae700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000118c000 CR3: 00000000881f7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400