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Message-ID: <VI1PR0501MB2271CEE47389D5F207CD41DED1120@VI1PR0501MB2271.eurprd05.prod.outlook.com>
Date: Fri, 21 Sep 2018 14:06:36 +0000
From: Parav Pandit <parav@...lanox.com>
To: Parav Pandit <parav@...lanox.com>,
syzbot <syzbot+20c32fa6ff84a2d28c36@...kaller.appspotmail.com>,
Daniel Jurgens <danielj@...lanox.com>,
"dledford@...hat.com" <dledford@...hat.com>,
"jgg@...pe.ca" <jgg@...pe.ca>, "leon@...nel.org" <leon@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: RE: general protection fault in addr_resolve
> -----Original Message-----
> From: linux-rdma-owner@...r.kernel.org <linux-rdma-
> owner@...r.kernel.org> On Behalf Of Parav Pandit
> Sent: Friday, September 21, 2018 8:53 AM
> To: syzbot <syzbot+20c32fa6ff84a2d28c36@...kaller.appspotmail.com>;
> Daniel Jurgens <danielj@...lanox.com>; dledford@...hat.com;
> jgg@...pe.ca; leon@...nel.org; linux-kernel@...r.kernel.org; linux-
> rdma@...r.kernel.org; syzkaller-bugs@...glegroups.com
> Subject: RE: general protection fault in addr_resolve
>
>
>
> > -----Original Message-----
> > From: syzbot <syzbot+20c32fa6ff84a2d28c36@...kaller.appspotmail.com>
> > Sent: Friday, September 21, 2018 3:35 AM
> > To: Daniel Jurgens <danielj@...lanox.com>; dledford@...hat.com;
> > jgg@...pe.ca; leon@...nel.org; linux-kernel@...r.kernel.org; linux-
> > rdma@...r.kernel.org; Parav Pandit <parav@...lanox.com>; syzkaller-
> > bugs@...glegroups.com
> > Subject: general protection fault in addr_resolve
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: a0cb0cabe4bb Add linux-next specific files for 20180920
> > git tree: linux-next
> > console output:
> > https://syzkaller.appspot.com/x/log.txt?x=14b14e2a400000
> > kernel config:
> > https://syzkaller.appspot.com/x/.config?x=786006c5dafbadf6
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=20c32fa6ff84a2d28c36
> > compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+20c32fa6ff84a2d28c36@...kaller.appspotmail.com
> >
> > kasan: GPF could be caused by NULL-ptr deref or user memory access
> > general protection fault: 0000 [#1] PREEMPT SMP KASAN
> > CPU: 0 PID: 976 Comm: syz-executor4 Not tainted
> > 4.19.0-rc4-next-20180920+
> > #76
> > Hardware name: Google Google Compute Engine/Google Compute Engine,
> > BIOS Google 01/01/2011
> > RIP: 0010:copy_src_l2_addr drivers/infiniband/core/addr.c:489 [inline]
> > RIP: 0010:rdma_set_src_addr_rcu drivers/infiniband/core/addr.c:518
> > [inline]
> > RIP: 0010:addr_resolve+0x7c4/0x1c90 drivers/infiniband/core/addr.c:593
> > Code: 0f 84 dd 01 00 00 e8 9b 6c e9 fb 48 8b 85 d8 fd ff ff 48 8d b8
> > 54 02
> > 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02
> > 48
> > 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 24
> > RSP: 0018:ffff8801c863f360 EFLAGS: 00010202
> > RAX: dffffc0000000000 RBX: ffff8801c863f578 RCX: ffffc90003e76000
> > RDX: 000000000000003e RSI: ffffffff8593e355 RDI: 00000000000001f1
> > RBP: ffff8801c863f5a0 R08: ffff8801d95722c0 R09: ffffed003b585b57
> > R10: ffffed003b585b57 R11: ffff8801dac2dabb R12: ffff8801d78a1560
> > R13: 0000000000000001 R14: 000000000000000a R15: 0000000000000000
> > kobject: 'loop5' (000000009a4a0383): kobject_uevent_env
> > FS: 00007fefce9ca700(0000) GS:ffff8801dac00000(0000)
> > knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 0000000000706158 CR3: 00000001d370a000 CR4: 00000000001406f0
> Call
> > Trace:
> > kobject: 'loop5' (000000009a4a0383): fill_kobj_path: path =
> > '/devices/virtual/block/loop5'
> > rdma_resolve_ip+0x499/0x790 drivers/infiniband/core/addr.c:697
> > rdma_resolve_addr+0x2d6/0x2870 drivers/infiniband/core/cma.c:2992
> > kobject: 'loop3' (00000000f158c859): kobject_uevent_env
> > kobject: 'loop3' (00000000f158c859): fill_kobj_path: path =
> > '/devices/virtual/block/loop3'
> > ucma_resolve_ip+0x242/0x2a0 drivers/infiniband/core/ucma.c:713
> > ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1686
> > __vfs_write+0x119/0x9f0 fs/read_write.c:485
> > kobject: 'loop2' (00000000ed1b199d): kobject_uevent_env
> > vfs_write+0x1fc/0x560 fs/read_write.c:549
> > kobject: 'loop2' (00000000ed1b199d): fill_kobj_path: path =
> > '/devices/virtual/block/loop2'
> > ksys_write+0x101/0x260 fs/read_write.c:598
> > __do_sys_write fs/read_write.c:610 [inline]
> > __se_sys_write fs/read_write.c:607 [inline]
> > __x64_sys_write+0x73/0xb0 fs/read_write.c:607
> > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
> > entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > RIP: 0033:0x457679
> > Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> > RSP: 002b:00007fefce9c9c78 EFLAGS: 00000246 ORIG_RAX:
> > 0000000000000001
> > RAX: ffffffffffffffda RBX: 00007fefce9ca6d4 RCX: 0000000000457679
> > RDX: 0000000000000048 RSI: 0000000020000100 RDI: 0000000000000004
> > RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
> > R13: 00000000004d8a48 R14: 00000000004cb698 R15: 0000000000000000
> > Modules linked in:
> > ---[ end trace 416e29924dbdc1a0 ]---
> > RIP: 0010:copy_src_l2_addr drivers/infiniband/core/addr.c:489 [inline]
> > RIP: 0010:rdma_set_src_addr_rcu drivers/infiniband/core/addr.c:518
> > [inline]
> > RIP: 0010:addr_resolve+0x7c4/0x1c90 drivers/infiniband/core/addr.c:593
> > Code: 0f 84 dd 01 00 00 e8 9b 6c e9 fb 48 8b 85 d8 fd ff ff 48 8d b8
> > 54 02
> > 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02
> > 48
> > 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 24
> > kobject: 'loop5' (000000009a4a0383): kobject_uevent_env
> > kobject: 'loop5' (000000009a4a0383): fill_kobj_path: path =
> > '/devices/virtual/block/loop5'
> > RSP: 0018:ffff8801c863f360 EFLAGS: 00010202
> > RAX: dffffc0000000000 RBX: ffff8801c863f578 RCX: ffffc90003e76000
> > RDX: 000000000000003e RSI: ffffffff8593e355 RDI: 00000000000001f1
> > RBP: ffff8801c863f5a0 R08: ffff8801d95722c0 R09: ffffed003b585b57
> > R10: ffffed003b585b57 R11: ffff8801dac2dabb R12: ffff8801d78a1560
> > R13: 0000000000000001 R14: 000000000000000a R15: 0000000000000000
> > FS: 00007fefce9ca700(0000) GS:ffff8801dac00000(0000)
> > knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: ffffffffffffffef CR3: 00000001d370a000 CR4: 00000000001406f0
> >
> >
> > ---
> > This bug 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@...glegroups.com.
> >
> > syzbot will keep track of this bug report. See:
> > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> > syzbot.
>
> I think the fix is below.
>
> diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
> index 7a0356c..3edd10a 100644
> --- a/drivers/infiniband/core/addr.c
> +++ b/drivers/infiniband/core/addr.c
> @@ -511,7 +511,7 @@ static int rdma_set_src_addr_rcu(struct
> rdma_dev_addr *dev_addr,
> * loopback IP address.
> */
> ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
> - if (!ndev)
> + if (IS_ERR(dev))
> return -ENODEV;
> }
Corrected the typo of previous email patch.
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 7a0356c..be92e95 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -511,7 +511,7 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
* loopback IP address.
*/
ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
- if (!ndev)
+ if (IS_ERR(ndev))
return -ENODEV;
}
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