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SubjectPCI: BUG in pci_epf_remove_cfs() from pci-epf-test
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This is Linux v5.0-11053-gebc551f2b8f9 from March 12, on x86_64.

Just load and unload the pci-epf-test module.


[ 78.942581] calling pci_epf_test_init+0x0/0x1000 [pci_epf_test] @ 1650
[ 78.945926] initcall pci_epf_test_init+0x0/0x1000 [pci_epf_test] returned 0 after 3216 usecs
[ 91.293344] ==================================================================
[ 91.293381] BUG: KASAN: use-after-free in pci_epf_remove_cfs+0x1b0/0x1f0
[ 91.293404] Write of size 8 at addr ffff888111843388 by task rmmod/1672

[ 91.293435] CPU: 3 PID: 1672 Comm: rmmod Not tainted 5.0.0mod #1
[ 91.293454] Hardware name: TOSHIBA PORTEGE R835/Portable PC, BIOS Version 4.10 01/08/2013
[ 91.293486] Call Trace:
[ 91.293501] dump_stack+0x7b/0xb5
[ 91.293520] print_address_description+0x6e/0x360
[ 91.293544] kasan_report+0x11a/0x198
[ 91.293568] ? kasan_slab_free+0xe/0x10
[ 91.293583] ? pci_epf_remove_cfs+0x1b0/0x1f0
[ 91.293602] ? pci_epf_remove_cfs+0x1b0/0x1f0
[ 91.293620] __asan_report_store8_noabort+0x17/0x20
[ 91.293638] pci_epf_remove_cfs+0x1b0/0x1f0
[ 91.293658] pci_epf_unregister_driver+0xd/0x20
[ 91.293678] pci_epf_test_exit+0x10/0x18 [pci_epf_test]
[ 91.293697] __x64_sys_delete_module+0x329/0x490
[ 91.293715] ? __ia32_sys_delete_module+0x490/0x490
[ 91.293736] ? blkcg_exit_queue+0x20/0x20
[ 91.293751] ? _raw_spin_unlock_irq+0x22/0x40
[ 91.293778] do_syscall_64+0xaa/0x310
[ 91.293793] ? prepare_exit_to_usermode+0x8b/0x150
[ 91.293812] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 91.293830] RIP: 0033:0x7f7494f5af77
[ 91.293845] Code: 73 01 c3 48 8b 0d 21 af 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 ae 2b 00 f7 d8 64 89 01 48
[ 91.293893] RSP: 002b:00007fff91ebf118 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
[ 91.293917] RAX: ffffffffffffffda RBX: 00007fff91ebf178 RCX: 00007f7494f5af77
[ 91.293938] RDX: 000000000000000a RSI: 0000000000000800 RDI: 000055b8934a47d8
[ 91.293959] RBP: 000055b8934a4770 R08: 00007fff91ebe091 R09: 0000000000000000
[ 91.293980] R10: 00007f7494fca1c0 R11: 0000000000000206 R12: 00007fff91ebf340
[ 91.294001] R13: 00007fff91ec173e R14: 000055b8934a4260 R15: 000055b8934a4770

[ 91.294042] Allocated by task 1650:
[ 91.294057] save_stack+0x43/0xd0
[ 91.294071] __kasan_kmalloc.constprop.8+0xa7/0xd0
[ 91.294088] kasan_kmalloc+0x9/0x10
[ 91.294104] configfs_register_default_group+0x63/0xe0
[ 91.294121] pci_ep_cfs_add_epf_group+0x20/0x50
[ 91.294138] __pci_epf_register_driver+0x2b2/0x410
[ 91.294154] 0xffffffffc1d18032
[ 91.294168] do_one_initcall+0xab/0x2ad
[ 91.294182] do_init_module+0x1c7/0x548
[ 91.294197] load_module+0x46bb/0x5da0
[ 91.294211] __do_sys_finit_module+0x193/0x1b0
[ 91.294227] __x64_sys_finit_module+0x6e/0xb0
[ 91.294243] do_syscall_64+0xaa/0x310
[ 91.294257] entry_SYSCALL_64_after_hwframe+0x44/0xa9

[ 91.294282] Freed by task 1672:
[ 91.294295] save_stack+0x43/0xd0
[ 91.294309] __kasan_slab_free+0x137/0x190
[ 91.294324] kasan_slab_free+0xe/0x10
[ 91.294339] kfree+0xb0/0x1b0
[ 91.294352] configfs_unregister_default_group+0x15/0x20
[ 91.294370] pci_ep_cfs_remove_epf_group+0x17/0x20
[ 91.294387] pci_epf_remove_cfs+0x8e/0x1f0
[ 91.294403] pci_epf_unregister_driver+0xd/0x20
[ 91.294419] pci_epf_test_exit+0x10/0x18 [pci_epf_test]
[ 91.294437] __x64_sys_delete_module+0x329/0x490
[ 91.294454] do_syscall_64+0xaa/0x310
[ 91.294475] entry_SYSCALL_64_after_hwframe+0x44/0xa9

[ 91.294503] The buggy address belongs to the object at ffff888111843308
which belongs to the cache kmalloc-192 of size 192
[ 91.294547] The buggy address is located 128 bytes inside of
192-byte region [ffff888111843308, ffff8881118433c8)
[ 91.294579] The buggy address belongs to the page:
[ 91.294596] page:ffffea0004461000 count:1 mapcount:0 mapping:ffff888107c10e40 index:0xffff888111841fe8 compound_mapcount: 0
[ 91.294628] flags: 0x17ffffc0010200(slab|head)
[ 91.294646] raw: 0017ffffc0010200 ffffea0004696208 ffff888107c03690 ffff888107c10e40
[ 91.294670] raw: ffff888111841fe8 00000000001e0014 00000001ffffffff 0000000000000000
[ 91.294692] page dumped because: kasan: bad access detected

[ 91.294717] Memory state around the buggy address:
[ 91.294734] ffff888111843280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 91.294756] ffff888111843300: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 91.294777] >ffff888111843380: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
[ 91.294798] ^
[ 91.294812] ffff888111843400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 91.294833] ffff888111843480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 91.294854] ==================================================================

--
~Randy

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