================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline] BUG: KASAN: slab-out-of-bounds in bpf_prog_create+0xe9/0x250 net/core/filter.c:1351 Read of size 640 at addr ffff8880a3cd6000 by task syz-executor.2/6178 CPU: 0 PID: 6178 Comm: syz-executor.2 Not tainted 5.4.0-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/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x24/0x50 mm/kasan/common.c:125 memcpy include/linux/string.h:380 [inline] bpf_prog_create+0xe9/0x250 net/core/filter.c:1351 get_filter.isra.0+0x108/0x1a0 drivers/net/ppp/ppp_generic.c:572 ppp_get_filter drivers/net/ppp/ppp_generic.c:584 [inline] ppp_ioctl+0x12f7/0x2750 drivers/net/ppp/ppp_generic.c:801 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a679 Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fef8cf61c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000020000080 RSI: 0000000040107446 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fef8cf626d4 R13: 00000000004c470d R14: 00000000004d9e80 R15: 00000000ffffffff Allocated by task 6178: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc_track_caller+0x15f/0x760 mm/slab.c:3671 memdup_user+0x26/0xd0 mm/util.c:172 get_filter.isra.0+0xd7/0x1a0 drivers/net/ppp/ppp_generic.c:568 ppp_get_filter drivers/net/ppp/ppp_generic.c:584 [inline] ppp_ioctl+0x12f7/0x2750 drivers/net/ppp/ppp_generic.c:801 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 633: 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:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 ext4_swap_extents+0xa95/0x1520 fs/ext4/extents.c:5981 move_extent_per_page fs/ext4/move_extent.c:339 [inline] ext4_move_extents+0x1a60/0x4310 fs/ext4/move_extent.c:673 ext4_ioctl+0x3359/0x4f00 fs/ext4/ioctl.c:992 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 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 ffff8880a3cd6000 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff8880a3cd6000, ffff8880a3cd6060) The buggy address belongs to the page: page:ffffea00028f3580 refcount:1 mapcount:0 mapping:ffff8880aa400540 index:0xffff8880a3cd6d80 raw: 00fffe0000000200 ffffea00028c7288 ffffea00024779c8 ffff8880aa400540 raw: ffff8880a3cd6d80 ffff8880a3cd6000 0000000100000017 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a3cd5f00: fc fb fb fb fb fb fb fb fb fb fc fc fc fc fb fb ffff8880a3cd5f80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc >ffff8880a3cd6000: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff8880a3cd6080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880a3cd6100: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ==================================================================