On Mon, Mar 09, 2020 at 04:32:00PM -0300, Jason Gunthorpe wrote:
> If name memory allocation fails the name will be left empty and
> device_add_one() will crash:
>
> kobject: (0000000004952746): attempted to be registered with empty name!
> WARNING: CPU: 0 PID: 329 at lib/kobject.c:234 kobject_add_internal+0x7ac/0x9a0 lib/kobject.c:234
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 0 PID: 329 Comm: syz-executor.5 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
> panic+0x2e3/0x75c kernel/panic.c:221
> __warn.cold+0x2f/0x3e kernel/panic.c:582
> report_bug+0x289/0x300 lib/bug.c:195
> fixup_bug arch/x86/kernel/traps.c:174 [inline]
> fixup_bug arch/x86/kernel/traps.c:169 [inline]
> do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
> do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
> invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
> RIP: 0010:kobject_add_internal+0x7ac/0x9a0 lib/kobject.c:234
> Code: 1a 98 ca f9 e9 f0 f8 ff ff 4c 89 f7 e8 6d 98 ca f9 e9 95 f9 ff ff e8 c3 f0 8b f9 4c 89 e6 48 c7 c7 a0 0e 1a 89 e8 e3 41 5c f9 <0f> 0b 41 bd ea ff ff ff e9 52 ff ff ff e8 a2 f0 8b f9 0f 0b e8 9b
> RSP: 0018:ffffc90005b27908 EFLAGS: 00010286
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000040000 RSI: ffffffff815eae46 RDI: fffff52000b64f13
> RBP: ffffc90005b27960 R08: ffff88805aeba480 R09: ffffed1015d06659
> R10: ffffed1015d06658 R11: ffff8880ae8332c7 R12: ffff8880a37fd000
> R13: 0000000000000000 R14: ffff888096691780 R15: 0000000000000001
> kobject_add_varg lib/kobject.c:390 [inline]
> kobject_add+0x150/0x1c0 lib/kobject.c:442
> device_add+0x3be/0x1d00 drivers/base/core.c:2412
> add_one_compat_dev drivers/infiniband/core/device.c:901 [inline]
> add_one_compat_dev+0x46a/0x7e0 drivers/infiniband/core/device.c:857
> rdma_dev_init_net+0x2eb/0x490 drivers/infiniband/core/device.c:1120
> ops_init+0xb3/0x420 net/core/net_namespace.c:137
> setup_net+0x2d5/0x8b0 net/core/net_namespace.c:327
> copy_net_ns+0x29e/0x5a0 net/core/net_namespace.c:468
> create_new_namespaces+0x403/0xb50 kernel/nsproxy.c:108
> unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:229
> ksys_unshare+0x444/0x980 kernel/fork.c:2955
> __do_sys_unshare kernel/fork.c:3023 [inline]
> __se_sys_unshare kernel/fork.c:3021 [inline]
> __x64_sys_unshare+0x31/0x40 kernel/fork.c:3021
> do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> Cc: stable@xxxxxxxxxx
> Fixes: 4e0f7b907072 ("RDMA/core: Implement compat device/sysfs tree in net namespace")
> Reported-by: syzbot+ab4dae63f7d310641ded@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> ---
> drivers/infiniband/core/device.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
Applied to for-rc
Jason
