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At 2022-09-01 14:34:09, "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+ Suggested-by: Sathya Prakash Veerichetty sathya.prakash@broadcom.com 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 | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c index def37a7e5980..7990bd9502e1 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c @@ -5704,24 +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) {

• 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) {
  

• if (sas_device_priv_data->sas_target->deleted) { scmd->result = DID_NO_CONNECT << 16; goto out; }

-- 2.27.0

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