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-- Jackie Liu 在 2022/9/1 14:03, huhai 写道: > > At 2022-09-01 13:08:14, "Sathya Prakash Veerichetty" sathya.prakash@broadcom.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@163.com wrote: >>> >>> Friendly ping. >>> >>> >>> At 2022-08-25 17:26:45, "huhai" 15815827059@163.com wrote: >>>> From: huhai huhai@kylinos.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@vger.kernel.org # v4.9+ >>>> Co-developed-by: Jackie Liu liuyun01@kylinos.cn >>>> Signed-off-by: Jackie Liu liuyun01@kylinos.cn >>>> Signed-off-by: huhai huhai@kylinos.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 >> >> -- >> This electronic communication and the information and any files transmitted >> with it, or attached to it, are confidential and are intended solely for >> the use of the individual or entity to whom it is addressed and may contain >> information that is confidential, legally privileged, protected by privacy >> laws, or otherwise restricted from disclosure to anyone else. If you are >> not the intended recipient or the person responsible for delivering the >> e-mail to the intended recipient, you are hereby notified that any use, >> copying, distributing, dissemination, forwarding, printing, or copying of >> this e-mail is strictly prohibited. If you received this e-mail in error, >> please return the e-mail to the sender, delete it from your computer, and >> destroy any printed copy of it.