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Subject: Re: [syzbot] [kernel?] general protection fault in vhost_task_start Content-Language: en-US To: syzbot , brauner@kernel.org, jasowang@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, virtualization@lists.linux-foundation.org References: <0000000000005a60a305f76c07dc@google.com> From: Mike Christie In-Reply-To: <0000000000005a60a305f76c07dc@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DM6PR02CA0116.namprd02.prod.outlook.com (2603:10b6:5:1b4::18) To DM5PR10MB1466.namprd10.prod.outlook.com (2603:10b6:3:b::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM5PR10MB1466:EE_|DS0PR10MB7065:EE_ X-MS-Office365-Filtering-Correlation-Id: 9ad4db3e-423d-49c5-3088-08db2a34252e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-21_11,2023-03-21_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 malwarescore=0 adultscore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 phishscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303150002 definitions=main-2303210140 X-Proofpoint-ORIG-GUID: v3IxDMIzbBvd4McceXA5jUo1Zh73v9sm X-Proofpoint-GUID: v3IxDMIzbBvd4McceXA5jUo1Zh73v9sm Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/21/23 12:03 PM, syzbot wrote: > RIP: 0010:vhost_task_start+0x22/0x40 kernel/vhost_task.c:115 > Code: 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 53 48 89 fb e8 c3 67 2c 00 48 8d 7b 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 0a 48 8b 7b 70 5b e9 fe bd 02 00 e8 79 ec 7e 00 eb > RSP: 0018:ffffc90003a9fc38 EFLAGS: 00010207 > RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 0000000000000000 > RDX: 000000000000000c RSI: ffffffff81564c8d RDI: 0000000000000064 > RBP: ffff88802b21dd40 R08: 0000000000000100 R09: ffffffff8c917cf3 > R10: 00000000fffffff4 R11: 0000000000000000 R12: fffffffffffffff4 > R13: ffff888075d000b0 R14: ffff888075d00000 R15: ffff888075d00008 > FS: 0000555556247300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffe3d8e5ff8 CR3: 00000000215d4000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > vhost_worker_create drivers/vhost/vhost.c:580 [inline] The return value from vhost_task_create is incorrect if the kzalloc fails. Christian, here is a fix for what's in your tree. Do you want me to submit a follow up patch like this or a replacement patch for: commit 77feab3c4156 ("vhost_task: Allow vhost layer to use copy_process") with the fix rolled into it? >From 0677ad6d77722f301ca35e8e0f8fd0cbd5ed8484 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 21 Mar 2023 12:39:39 -0500 Subject: [PATCH] vhost_task: Fix vhost_task_create return value vhost_task_create is supposed to return the vhost_task or NULL on failure. This fixes it to return the correct value when the allocation of the struct fails. --- kernel/vhost_task.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/vhost_task.c b/kernel/vhost_task.c index 4b8aff160640..b7cbd66f889e 100644 --- a/kernel/vhost_task.c +++ b/kernel/vhost_task.c @@ -88,7 +88,7 @@ struct vhost_task *vhost_task_create(int (*fn)(void *), void *arg, vtsk = kzalloc(sizeof(*vtsk), GFP_KERNEL); if (!vtsk) - return ERR_PTR(-ENOMEM); + return NULL; init_completion(&vtsk->exited); vtsk->data = arg; vtsk->fn = fn;