Re: [PATCH] scsi: mpt3sas: Fix NULL pointer crash due to missing check device hostdata
From: Jackie Liu
Date: Thu Sep 01 2022 - 02:12:47 EST
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@xxxxxxxxxxxx> 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@xxxxxxx> wrote:
Friendly ping.
At 2022-08-25 17:26:45, "huhai" <15815827059@xxxxxxx> wrote:
From: huhai <huhai@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx> # v4.9+
Co-developed-by: Jackie Liu <liuyun01@xxxxxxxxxx>
Signed-off-by: Jackie Liu <liuyun01@xxxxxxxxxx>
Signed-off-by: huhai <huhai@xxxxxxxxxx>
---
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
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