linux-kernel - Re: KASAN: null-ptr-deref Write in rdma_resolve

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Date:   Tue, 13 Mar 2018 21:39:02 -0700
From:   syzbot <syzbot+1d8c43206853b369d00c@...kaller.appspotmail.com>
To:     dasaratharaman.chandramouli@...el.com, dledford@...hat.com,
        jgg@...pe.ca, leonro@...lanox.com, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, markb@...lanox.com, monis@...lanox.com,
        parav@...lanox.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: null-ptr-deref Write in rdma_resolve_addr

syzbot has found reproducer for the following crash on upstream commit
fc6eabbbf8ef99efed778dd5afabc83c21dba585 (Mon Mar 12 17:47:03 2018 +0000)
Merge tag 'nfs-for-4.16-4' of  
git://git.linux-nfs.org/projects/trondmy/linux-nfs

So far this crash happened 16 times on upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1d8c43206853b369d00c@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

==================================================================
BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:345 [inline]
BUG: KASAN: null-ptr-deref in rdma_resolve_addr+0x12e/0x26c0  
drivers/infiniband/core/cma.c:2920
Write of size 28 at addr 00000000000000a0 by task syzkaller326171/7671

CPU: 0 PID: 7671 Comm: syzkaller326171 Not tainted 4.16.0-rc5+ #352
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
  kasan_report_error mm/kasan/report.c:352 [inline]
  kasan_report+0x140/0x360 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+0x37/0x50 mm/kasan/kasan.c:303
  memcpy include/linux/string.h:345 [inline]
  rdma_resolve_addr+0x12e/0x26c0 drivers/infiniband/core/cma.c:2920
  ucma_resolve_ip+0x142/0x1f0 drivers/infiniband/core/ucma.c:677
  ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1633
  __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: 0033:0x446b29
RSP: 002b:00007f72069e1da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000006e29fc RCX: 0000000000446b29
RDX: 000000000000002e RSI: 0000000020000c40 RDI: 0000000000000004
RBP: 00000000006e29f8 R08: 00007f72069e2700 R09: 0000000000000000
R10: 00007f72069e2700 R11: 0000000000000246 R12: 006d635f616d6472
R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000004
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7671 Comm: syzkaller326171 Tainted: G    B             
4.16.0-rc5+ #352
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
  panic+0x1e4/0x41c kernel/panic.c:183
  kasan_end_report+0x50/0x50 mm/kasan/report.c:180
  kasan_report_error mm/kasan/report.c:359 [inline]
  kasan_report+0x149/0x360 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+0x37/0x50 mm/kasan/kasan.c:303
  memcpy include/linux/string.h:345 [inline]
  rdma_resolve_addr+0x12e/0x26c0 drivers/infiniband/core/cma.c:2920
  ucma_resolve_ip+0x142/0x1f0 drivers/infiniband/core/ucma.c:677
  ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1633
  __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: 0033:0x446b29
RSP: 002b:00007f72069e1da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000006e29fc RCX: 0000000000446b29
RDX: 000000000000002e RSI: 0000000020000c40 RDI: 0000000000000004
RBP: 00000000006e29f8 R08: 00007f72069e2700 R09: 0000000000000000
R10: 00007f72069e2700 R11: 0000000000000246 R12: 006d635f616d6472
R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000004
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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