Hello, syzbot found the following issue on: HEAD commit: 12d125b4574b stmmac: Revert "stmmac: align RX buffers" git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=17c6e38d300000 kernel config: https://syzkaller.appspot.com/x/.config?x=96f0602203250753 dashboard link: https://syzkaller.appspot.com/bug?extid=1fa91bcd05206ff8cbb5 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12618c05300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e60d05300000 The issue was bisected to: commit 130b392c6cd6b2aed1b7eb32253d4920babb4891 Author: Dave Watson <davejwatson@xxxxxx> Date: Wed Jan 30 21:58:31 2019 +0000 net: tls: Add tls 1.3 support bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13694355300000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10e94355300000 console output: https://syzkaller.appspot.com/x/log.txt?x=17694355300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1fa91bcd05206ff8cbb5@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 130b392c6cd6 ("net: tls: Add tls 1.3 support") ================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: slab-out-of-bounds in __refcount_add_not_zero include/linux/refcount.h:152 [inline] BUG: KASAN: slab-out-of-bounds in __refcount_inc_not_zero include/linux/refcount.h:227 [inline] BUG: KASAN: slab-out-of-bounds in refcount_inc_not_zero include/linux/refcount.h:245 [inline] BUG: KASAN: slab-out-of-bounds in sk_psock_get+0x123/0x410 include/linux/skmsg.h:449 Read of size 4 at addr ffff888011d9c2b8 by task syz-executor654/8452 CPU: 0 PID: 8452 Comm: syz-executor654 Not tainted 5.14.0-rc6-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 include/linux/instrumented.h:71 [inline] atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] __refcount_add_not_zero include/linux/refcount.h:152 [inline] __refcount_inc_not_zero include/linux/refcount.h:227 [inline] refcount_inc_not_zero include/linux/refcount.h:245 [inline] sk_psock_get+0x123/0x410 include/linux/skmsg.h:449 tls_sw_recvmsg+0x19e/0x1670 net/tls/tls_sw.c:1761 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:852 sock_recvmsg_nosec net/socket.c:943 [inline] sock_recvmsg net/socket.c:961 [inline] sock_recvmsg net/socket.c:957 [inline] ____sys_recvmsg+0x2c4/0x600 net/socket.c:2611 ___sys_recvmsg+0x127/0x200 net/socket.c:2653 do_recvmmsg+0x24d/0x6d0 net/socket.c:2747 __sys_recvmmsg net/socket.c:2826 [inline] __do_sys_recvmmsg net/socket.c:2849 [inline] __se_sys_recvmmsg net/socket.c:2842 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2842 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: 0033:0x43f4f9 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:00007ffd2e991cd8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043f4f9 RDX: 000000000000000a RSI: 00000000200030c0 RDI: 0000000000000005 RBP: 00000000004034e0 R08: 0000000000000000 R09: 0000000000400488 R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000403570 R13: 0000000000000000 R14: 00000000004ad018 R15: 0000000000400488 Allocated by task 8452: 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_slab_alloc+0x84/0xa0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2959 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x285/0x4a0 mm/slub.c:2972 kmem_cache_zalloc include/linux/slab.h:711 [inline] kcm_attach net/kcm/kcmsock.c:1404 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1489 [inline] kcm_ioctl+0x7f1/0x1180 net/kcm/kcmsock.c:1695 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1094 sock_ioctl+0x477/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 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 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1332 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1498 queue_work_on+0xee/0x110 kernel/workqueue.c:1525 kcm_attach net/kcm/kcmsock.c:1465 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1489 [inline] kcm_ioctl+0xede/0x1180 net/kcm/kcmsock.c:1695 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1094 sock_ioctl+0x477/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 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 ffff888011d9c000 which belongs to the cache kcm_psock_cache of size 568 The buggy address is located 128 bytes to the right of 568-byte region [ffff888011d9c000, ffff888011d9c238) The buggy address belongs to the page: page:ffffea0000476700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d9c head:ffffea0000476700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff8881478543c0 raw: 0000000000000000 0000000080170017 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8452, ts 72409999814, free_ts 72272935271 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1691 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1831 new_slab mm/slub.c:1894 [inline] new_slab_objects mm/slub.c:2640 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2803 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843 slab_alloc_node mm/slub.c:2925 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc+0x3e1/0x4a0 mm/slub.c:2972 kmem_cache_zalloc include/linux/slab.h:711 [inline] kcm_attach net/kcm/kcmsock.c:1404 [inline] kcm_attach_ioctl net/kcm/kcmsock.c:1489 [inline] kcm_ioctl+0x7f1/0x1180 net/kcm/kcmsock.c:1695 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1094 sock_ioctl+0x477/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 __put_page+0xf9/0x3f0 mm/swap.c:127 put_page include/linux/mm.h:1246 [inline] __skb_frag_unref include/linux/skbuff.h:3102 [inline] skb_release_data+0x49d/0x790 net/core/skbuff.c:671 skb_release_all net/core/skbuff.c:741 [inline] __kfree_skb net/core/skbuff.c:755 [inline] consume_skb net/core/skbuff.c:911 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:905 unix_stream_read_generic+0x15a2/0x19e0 net/unix/af_unix.c:2460 unix_stream_recvmsg+0xb1/0xf0 net/unix/af_unix.c:2518 sock_recvmsg_nosec net/socket.c:943 [inline] sock_recvmsg net/socket.c:961 [inline] sock_recvmsg net/socket.c:957 [inline] sock_read_iter+0x33c/0x470 net/socket.c:1034 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read+0x5b7/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x1ee/0x250 fs/read_write.c:634 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 Memory state around the buggy address: ffff888011d9c180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888011d9c200: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff888011d9c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888011d9c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888011d9c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
