================================================================== BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: stack-out-of-bounds in rdma_bind_addr+0x13b/0x1d60 drivers/infiniband/core/cma.c:3361 Read of size 48 at addr ffff8801c8627a50 by task syz-executor3/14428 CPU: 1 PID: 14428 Comm: syz-executor3 Not tainted 4.16.0-rc7+ #370 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x137/0x190 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] rdma_bind_addr+0x13b/0x1d60 drivers/infiniband/core/cma.c:3361 ucma_bind_ip+0x10a/0x190 drivers/infiniband/core/ucma.c:639 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4548b9 RSP: 002b:00007ff1c3ae9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff1c3aea6d4 RCX: 00000000004548b9 RDX: 0000000000000090 RSI: 0000000020000080 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006a9 R14: 00000000006fc078 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea00072189c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 ffffea0007210101 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c8627900: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 ffff8801c8627980: f2 f2 f2 f2 f2 f2 04 f2 f2 f2 f3 f3 f3 f3 00 00 >ffff8801c8627a00: 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 ^ ffff8801c8627a80: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 ffff8801c8627b00: f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00 ==================================================================