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Date: Thu, 1 Sep 2022 14:12:23 +0800
From: Jackie Liu <liu.yun@...ux.dev>
To: huhai <15815827059@....com>,
Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>
Cc: jejb@...ux.ibm.com,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
Suganath Prabu Subramani
<suganath-prabu.subramani@...adcom.com>,
PDL-MPT-FUSIONLINUX <MPT-FusionLinux.pdl@...adcom.com>,
linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
huhai <huhai@...inos.cn>, stable@...r.kernel.org
Subject: Re: [PATCH] scsi: mpt3sas: Fix NULL pointer crash due to missing
check device hostdata
hu hai:
I think Sathya means this:
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index def37a7e5980..2a8c1fef1d34 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -5704,27 +5704,31 @@ _scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16
smid, u8 msix_index, u32 reply)
struct MPT3SAS_DEVICE *sas_device_priv_data;
u32 response_code = 0;
- mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
-
scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
if (scmd == NULL)
return 1;
+ sas_device_priv_data = scmd->device->hostdata;
+ if (!sas_device_priv_data || !sas_device_priv_data->sas_target)
+ scmd->result = DID_NO_CONNECT << 16;
+ goto out;
+ }
+
_scsih_set_satl_pending(scmd, false);
+ if (sas_device_priv_data->sas_target->deleted) {
+ scmd->result = DID_NO_CONNECT << 16;
+ goto out;
+ }
+
mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
+ mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
if (mpi_reply == NULL) {
scmd->result = DID_OK << 16;
goto out;
}
- sas_device_priv_data = scmd->device->hostdata;
- if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
- sas_device_priv_data->sas_target->deleted) {
- scmd->result = DID_NO_CONNECT << 16;
- goto out;
- }
ioc_status = le16_to_cpu(mpi_reply->IOCStatus);
/*
--
Jackie Liu
在 2022/9/1 14:03, huhai 写道:
>
> At 2022-09-01 13:08:14, "Sathya Prakash Veerichetty" <sathya.prakash@...adcom.com> wrote:
>> The patch could be improved to clear the ata_cmd_pending bit for the
>> cases !sas_device_priv_data->sas_target and
>> sas_device_priv_data->sas_target->deleted before returning
>
>> DID_NO_CONNECT to retain the current functionality.
>
> Hi,
>
> Maybe my commit information is not clear enough，This patch is fixed NULL pointer crash
> duto to "struct MPT3SAS_DEVICE *priv = scmd->device->hostdata;" got a NULL pointer, and
> when "clear_bit(0, &priv->ata_command_pending);" is called, kernel will panic.
>
> Thanks
>
>>
>>
>> On Wed, Aug 31, 2022 at 7:11 PM huhai <15815827059@....com> wrote:
>>>
>>> Friendly ping.
>>>
>>>
>>> At 2022-08-25 17:26:45, "huhai" <15815827059@....com> wrote:
>>>> From: huhai <huhai@...inos.cn>
>>>>
>>>> If _scsih_io_done() is called with scmd->device->hostdata=NULL, it can lead
>>>> to the following panic:
>>>>
>>>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
>>>> PGD 4547a4067 P4D 4547a4067 PUD 0
>>>> Oops: 0002 [#1] SMP NOPTI
>>>> CPU: 62 PID: 0 Comm: swapper/62 Kdump: loaded Not tainted 4.19.90-24.4.v2101.ky10.x86_64 #1
>>>> Hardware name: Storage Server/65N32-US, BIOS SQL1041217 05/30/2022
>>>> RIP: 0010:_scsih_set_satl_pending+0x2d/0x50 [mpt3sas]
>>>> Code: 00 00 48 8b 87 60 01 00 00 0f b6 10 80 fa a1 74 09 31 c0 80 fa 85 74 02 f3 c3 48 8b 47 38 40 84 f6 48 8b 80 98 00 00 00 75 08 <f0> 80 60 18 fe 31 c0 c3 f0 48 0f ba 68 18 00 0f 92 c0 0f b6 c0 c3
>>>> RSP: 0018:ffff8ec22fc03e00 EFLAGS: 00010046
>>>> RAX: 0000000000000000 RBX: ffff8eba1b072518 RCX: 0000000000000001
>>>> RDX: 0000000000000085 RSI: 0000000000000000 RDI: ffff8eba1b072518
>>>> RBP: 0000000000000dbd R08: 0000000000000000 R09: 0000000000029700
>>>> R10: ffff8ec22fc03f80 R11: 0000000000000000 R12: ffff8ebe2d3609e8
>>>> R13: ffff8ebe2a72b600 R14: ffff8eca472707e0 R15: 0000000000000020
>>>> FS: 0000000000000000(0000) GS:ffff8ec22fc00000(0000) knlGS:0000000000000000
>>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> CR2: 0000000000000018 CR3: 000000046e5f6000 CR4: 00000000003406e0
>>>> Call Trace:
>>>> <IRQ>
>>>> _scsih_io_done+0x4a/0x9f0 [mpt3sas]
>>>> _base_interrupt+0x23f/0xe10 [mpt3sas]
>>>> __handle_irq_event_percpu+0x40/0x190
>>>> handle_irq_event_percpu+0x30/0x70
>>>> handle_irq_event+0x36/0x60
>>>> handle_edge_irq+0x7e/0x190
>>>> handle_irq+0xa8/0x110
>>>> do_IRQ+0x49/0xe0
>>>>
>>>> Fix it by move scmd->device->hostdata check before _scsih_set_satl_pending
>>>> called.
>>>>
>>>> Other changes:
>>>> - It looks clear to move get mpi_reply to near its check.
>>>>
>>>> Fixes: ffb584565894 ("scsi: mpt3sas: fix hang on ata passthrough commands")
>>>> Cc: <stable@...r.kernel.org> # v4.9+
>>>> Co-developed-by: Jackie Liu <liuyun01@...inos.cn>
>>>> Signed-off-by: Jackie Liu <liuyun01@...inos.cn>
>>>> Signed-off-by: huhai <huhai@...inos.cn>
>>>> ---
>>>> drivers/scsi/mpt3sas/mpt3sas_scsih.c | 15 +++++++--------
>>>> 1 file changed, 7 insertions(+), 8 deletions(-)
>>>>
>>>> diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
>>>> index def37a7e5980..85f5749a0421 100644
>>>> --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
>>>> +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
>>>> @@ -5704,27 +5704,26 @@ _scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
>>>> struct MPT3SAS_DEVICE *sas_device_priv_data;
>>>> u32 response_code = 0;
>>>>
>>>> - mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
>>>> -
>>>> scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
>>>> if (scmd == NULL)
>>>> return 1;
>>>>
>>>> + sas_device_priv_data = scmd->device->hostdata;
>>>> + if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
>>>> + sas_device_priv_data->sas_target->deleted) {
>>>> + scmd->result = DID_NO_CONNECT << 16;
>>>> + goto out;
>>>> + }
>>>> _scsih_set_satl_pending(scmd, false);
>>>>
>>>> mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
>>>>
>>>> + mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
>>>> if (mpi_reply == NULL) {
>>>> scmd->result = DID_OK << 16;
>>>> goto out;
>>>> }
>>>>
>>>> - sas_device_priv_data = scmd->device->hostdata;
>>>> - if (!sas_device_priv_data || !sas_device_priv_data->sas_target ||
>>>> - sas_device_priv_data->sas_target->deleted) {
>>>> - scmd->result = DID_NO_CONNECT << 16;
>>>> - goto out;
>>>> - }
>>>> ioc_status = le16_to_cpu(mpi_reply->IOCStatus);
>>>>
>>>> /*
>>>> --
>>>> 2.27.0
>>>>
>>>>
>>>> No virus found
>>>> Checked by Hillstone Network AntiVirus
>>
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