================================================================== BUG: KASAN: use-after-free in ethnl_bitmap32_not_zero net/ethtool/bitset.c:112 [inline] BUG: KASAN: use-after-free in ethnl_compact_sanity_checks net/ethtool/bitset.c:529 [inline] BUG: KASAN: use-after-free in ethnl_update_bitset32.part.0+0x8db/0x1820 net/ethtool/bitset.c:572 Read of size 4 at addr ffff8880a959ec3c by task syz-executor678/9427 CPU: 1 PID: 9427 Comm: syz-executor678 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:641 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 ethnl_bitmap32_not_zero net/ethtool/bitset.c:112 [inline] ethnl_compact_sanity_checks net/ethtool/bitset.c:529 [inline] ethnl_update_bitset32.part.0+0x8db/0x1820 net/ethtool/bitset.c:572 ethnl_update_bitset32 net/ethtool/bitset.c:562 [inline] ethnl_update_bitset+0x4d/0x67 net/ethtool/bitset.c:734 ethnl_update_linkmodes net/ethtool/linkmodes.c:304 [inline] ethnl_set_linkmodes+0x461/0xc30 net/ethtool/linkmodes.c:358 genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline] genl_family_rcv_msg net/netlink/genetlink.c:717 [inline] genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2478 genl_rcv+0x29/0x40 net/netlink/genetlink.c:745 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x753/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445b39 Code: e8 ac cb 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 ab cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffccda0bad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000445b39 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000bb1414ac R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9364: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] tomoyo_realpath_from_path+0xc5/0x660 security/tomoyo/realpath.c:252 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1dd/0x520 security/tomoyo/file.c:723 tomoyo_file_ioctl+0x23/0x30 security/tomoyo/tomoyo.c:335 security_file_ioctl+0x77/0xc0 security/security.c:1441 ksys_ioctl+0x56/0x180 fs/ioctl.c:757 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:770 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9364: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:476 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 tomoyo_realpath_from_path+0x1a7/0x660 security/tomoyo/realpath.c:289 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1dd/0x520 security/tomoyo/file.c:723 tomoyo_file_ioctl+0x23/0x30 security/tomoyo/tomoyo.c:335 security_file_ioctl+0x77/0xc0 security/security.c:1441 ksys_ioctl+0x56/0x180 fs/ioctl.c:757 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:770 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a959e000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3132 bytes inside of 4096-byte region [ffff8880a959e000, ffff8880a959f000) The buggy address belongs to the page: page:ffffea0002a56780 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0002654c88 ffffea000240de08 ffff8880aa402000 raw: 0000000000000000 ffff8880a959e000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a959eb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a959eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a959ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a959ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a959ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================