syzbot has found a reproducer for the following issue on: HEAD commit: 0d6835ffe50c net: phy: Fix data type in DP83822 dp8382x_di.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=15b3f6f2300000 kernel config: https://syzkaller.appspot.com/x/.config?x=da140227e4f25b17 dashboard link: https://syzkaller.appspot.com/bug?extid=b774577370208727d12b syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f6055c300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162a9040300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b774577370208727d12b@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:111 [inline] BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: use-after-free in sctp_auth_shkey_hold+0x22/0xa0 net/sctp/auth.c:112 Write of size 4 at addr ffff888027eb5018 by task syz-executor843/8468 CPU: 1 PID: 8468 Comm: syz-executor843 Not tainted 5.14.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:111 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sctp_auth_shkey_hold+0x22/0xa0 net/sctp/auth.c:112 sctp_set_owner_w net/sctp/socket.c:131 [inline] sctp_sendmsg_to_asoc+0x152e/0x2180 net/sctp/socket.c:1865 sctp_sendmsg+0x103b/0x1d30 net/sctp/socket.c:2027 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43efe9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff191e50c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0100000000000000 RCX: 000000000043efe9 RDX: 000000000000ffa0 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 0000000000402fd0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403060 R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488 Allocated by task 8468: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] sctp_auth_shkey_create+0x85/0x1f0 net/sctp/auth.c:84 sctp_auth_asoc_copy_shkeys+0x1e8/0x350 net/sctp/auth.c:363 sctp_association_init net/sctp/associola.c:257 [inline] sctp_association_new+0x1829/0x2250 net/sctp/associola.c:298 sctp_connect_new_asoc+0x1ac/0x770 net/sctp/socket.c:1088 __sctp_connect+0x3d0/0xc30 net/sctp/socket.c:1194 sctp_connect net/sctp/socket.c:4804 [inline] sctp_inet_connect+0x15e/0x200 net/sctp/socket.c:4819 __sys_connect_file+0x155/0x1a0 net/socket.c:1879 __sys_connect+0x161/0x190 net/socket.c:1896 __do_sys_connect net/socket.c:1906 [inline] __se_sys_connect net/socket.c:1903 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:1903 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 8468: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:229 [inline] slab_free_hook mm/slub.c:1650 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1675 slab_free mm/slub.c:3235 [inline] kfree+0xeb/0x650 mm/slub.c:4295 sctp_auth_shkey_destroy net/sctp/auth.c:101 [inline] sctp_auth_shkey_release+0x100/0x160 net/sctp/auth.c:107 sctp_auth_set_key+0x508/0x6d0 net/sctp/auth.c:862 sctp_setsockopt_auth_key net/sctp/socket.c:3643 [inline] sctp_setsockopt+0x4919/0xa5e0 net/sctp/socket.c:4682 __sys_setsockopt+0x2db/0x610 net/socket.c:2159 __do_sys_setsockopt net/socket.c:2170 [inline] __se_sys_setsockopt net/socket.c:2167 [inline] __x64_sys_setsockopt+0xba/0x150 net/socket.c:2167 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888027eb5000 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 24 bytes inside of 32-byte region [ffff888027eb5000, ffff888027eb5020) The buggy address belongs to the page: page:ffffea00009fad40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27eb5 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000056e240 0000000d0000000d ffff888010841500 raw: 0000000000000000 0000000080400040 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 15828671942, free_ts 14464854502 prep_new_page mm/page_alloc.c:2433 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4166 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1713 [inline] allocate_slab+0x32b/0x4c0 mm/slub.c:1853 new_slab mm/slub.c:1916 [inline] new_slab_objects mm/slub.c:2662 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2825 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2865 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2989 [inline] __kmalloc+0x312/0x330 mm/slub.c:4133 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x186/0x620 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x272/0x380 security/tomoyo/file.c:771 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline] tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:306 security_file_open+0x52/0x4f0 security/security.c:1633 do_dentry_open+0x353/0x11d0 fs/open.c:813 do_open fs/namei.c:3374 [inline] path_openat+0x1c23/0x27f0 fs/namei.c:3507 do_filp_open+0x1aa/0x400 fs/namei.c:3534 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1343 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1394 free_unref_page_prepare mm/page_alloc.c:3329 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3408 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2532 [inline] apply_to_pmd_range mm/memory.c:2576 [inline] apply_to_pud_range mm/memory.c:2612 [inline] apply_to_p4d_range mm/memory.c:2648 [inline] __apply_to_page_range+0x694/0x1080 mm/memory.c:2682 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:485 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1670 _vm_unmap_aliases.part.0+0x3f0/0x500 mm/vmalloc.c:2073 _vm_unmap_aliases mm/vmalloc.c:2047 [inline] vm_unmap_aliases+0x47/0x50 mm/vmalloc.c:2096 change_page_attr_set_clr+0x241/0x500 arch/x86/mm/pat/set_memory.c:1740 change_page_attr_set arch/x86/mm/pat/set_memory.c:1790 [inline] set_memory_nx+0xb2/0x110 arch/x86/mm/pat/set_memory.c:1938 free_init_pages+0x73/0xc0 arch/x86/mm/init.c:887 kernel_init+0x24/0x1d0 init/main.c:1491 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888027eb4f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff888027eb4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888027eb5000: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff888027eb5080: fb fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff888027eb5100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================
