diff mbox series

[06/10] qla2xxx: Fix kernel crash when accessing port_speed sysfs file

Message ID 20210908072846.10011-7-njavali@marvell.com
State New
Headers show
Series qla2xxx driver bug fixes | expand

Commit Message

Nilesh Javali Sept. 8, 2021, 7:28 a.m. UTC 
From: Arun Easi <aeasi@marvell.com>

Kernel crashes when accessing port_speed sysfs file.
The issue happens on a CNA when the local array was
accessed beyond bounds. Fix this by changing the lookup.

BUG: unable to handle kernel paging request at 0000000000004000
PGD 0 P4D 0
Oops: 0000 [#1] SMP PTI
CPU: 15 PID: 455213 Comm: sosreport Kdump: loaded Not tainted
4.18.0-305.7.1.el8_4.x86_64 #1
RIP: 0010:string_nocheck+0x12/0x70
Code: 00 00 4c 89 e2 be 20 00 00 00 48 89 ef e8 86 9a 00 00 4c 01
e3 eb 81 90 49 89 f2 48 89 ce 48 89 f8 48 c1 fe 30 66 85 f6 74 4f <44> 0f b6 0a
45 84 c9 74 46 83 ee 01 41 b8 01 00 00 00 48 8d 7c 37
RSP: 0018:ffffb5141c1afcf0 EFLAGS: 00010286
RAX: ffff8bf4009f8000 RBX: ffff8bf4009f9000 RCX: ffff0a00ffffff04
RDX: 0000000000004000 RSI: ffffffffffffffff RDI: ffff8bf4009f8000
RBP: 0000000000004000 R08: 0000000000000001 R09: ffffb5141c1afb84
R10: ffff8bf4009f9000 R11: ffffb5141c1afce6 R12: ffff0a00ffffff04
R13: ffffffffc08e21aa R14: 0000000000001000 R15: ffffffffc08e21aa
FS:  00007fc4ebfff700(0000) GS:ffff8c717f7c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000004000 CR3: 000000edfdee6006 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  string+0x40/0x50
  vsnprintf+0x33c/0x520
  scnprintf+0x4d/0x90
  qla2x00_port_speed_show+0xb5/0x100 [qla2xxx]
  dev_attr_show+0x1c/0x40
  sysfs_kf_seq_show+0x9b/0x100
  seq_read+0x153/0x410
  vfs_read+0x91/0x140
  ksys_read+0x4f/0xb0
  do_syscall_64+0x5b/0x1a0
  entry_SYSCALL_64_after_hwframe+0x65/0xca

Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
---
 drivers/scsi/qla2xxx/qla_attr.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

Comments

Himanshu Madhani Sept. 8, 2021, 2:04 p.m. UTC | #1 
> On Sep 8, 2021, at 2:28 AM, Nilesh Javali <njavali@marvell.com> wrote:

> 

> From: Arun Easi <aeasi@marvell.com>

> 

> Kernel crashes when accessing port_speed sysfs file.

> The issue happens on a CNA when the local array was

> accessed beyond bounds. Fix this by changing the lookup.

> 

> BUG: unable to handle kernel paging request at 0000000000004000

> PGD 0 P4D 0

> Oops: 0000 [#1] SMP PTI

> CPU: 15 PID: 455213 Comm: sosreport Kdump: loaded Not tainted

> 4.18.0-305.7.1.el8_4.x86_64 #1

> RIP: 0010:string_nocheck+0x12/0x70

> Code: 00 00 4c 89 e2 be 20 00 00 00 48 89 ef e8 86 9a 00 00 4c 01

> e3 eb 81 90 49 89 f2 48 89 ce 48 89 f8 48 c1 fe 30 66 85 f6 74 4f <44> 0f b6 0a

> 45 84 c9 74 46 83 ee 01 41 b8 01 00 00 00 48 8d 7c 37

> RSP: 0018:ffffb5141c1afcf0 EFLAGS: 00010286

> RAX: ffff8bf4009f8000 RBX: ffff8bf4009f9000 RCX: ffff0a00ffffff04

> RDX: 0000000000004000 RSI: ffffffffffffffff RDI: ffff8bf4009f8000

> RBP: 0000000000004000 R08: 0000000000000001 R09: ffffb5141c1afb84

> R10: ffff8bf4009f9000 R11: ffffb5141c1afce6 R12: ffff0a00ffffff04

> R13: ffffffffc08e21aa R14: 0000000000001000 R15: ffffffffc08e21aa

> FS:  00007fc4ebfff700(0000) GS:ffff8c717f7c0000(0000) knlGS:0000000000000000

> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033

> CR2: 0000000000004000 CR3: 000000edfdee6006 CR4: 00000000001706e0

> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

> Call Trace:

>  string+0x40/0x50

>  vsnprintf+0x33c/0x520

>  scnprintf+0x4d/0x90

>  qla2x00_port_speed_show+0xb5/0x100 [qla2xxx]

>  dev_attr_show+0x1c/0x40

>  sysfs_kf_seq_show+0x9b/0x100

>  seq_read+0x153/0x410

>  vfs_read+0x91/0x140

>  ksys_read+0x4f/0xb0

>  do_syscall_64+0x5b/0x1a0

>  entry_SYSCALL_64_after_hwframe+0x65/0xca

> 


Missing yet another 

Fixes: 4910b524ac9e6 ("scsi: qla2xxx: Add support for setting port speed”)
Cc: stable@vger.kernel.org

> Signed-off-by: Arun Easi <aeasi@marvell.com>

> Signed-off-by: Nilesh Javali <njavali@marvell.com>

> ---

> drivers/scsi/qla2xxx/qla_attr.c | 24 ++++++++++++++++++++++--

> 1 file changed, 22 insertions(+), 2 deletions(-)

> 

> diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c

> index d09776b77af2..cb5f2ecb652d 100644

> --- a/drivers/scsi/qla2xxx/qla_attr.c

> +++ b/drivers/scsi/qla2xxx/qla_attr.c

> @@ -1868,6 +1868,18 @@ qla2x00_port_speed_store(struct device *dev, struct device_attribute *attr,

> 	return strlen(buf);

> }

> 

> +static const struct {

> +	u16 rate;

> +	char *str;

> +} port_speed_str[] = {

> +	{ PORT_SPEED_4GB, "4" },

> +	{ PORT_SPEED_8GB, "8" },

> +	{ PORT_SPEED_16GB, "16" },

> +	{ PORT_SPEED_32GB, "32" },

> +	{ PORT_SPEED_64GB, "64" },

> +	{ PORT_SPEED_10GB, "10" },

> +};

> +

> static ssize_t

> qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr,

>     char *buf)

> @@ -1875,7 +1887,8 @@ qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr,

> 	struct scsi_qla_host *vha = shost_priv(dev_to_shost(dev));

> 	struct qla_hw_data *ha = vha->hw;

> 	ssize_t rval;

> -	char *spd[7] = {"0", "0", "0", "4", "8", "16", "32"};

> +	u16 i;

> +	char *speed = "Unknown";

> 

> 	rval = qla2x00_get_data_rate(vha);

> 	if (rval != QLA_SUCCESS) {

> @@ -1884,7 +1897,14 @@ qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr,

> 		return -EINVAL;

> 	}

> 

> -	return scnprintf(buf, PAGE_SIZE, "%s\n", spd[ha->link_data_rate]);

> +	for (i = 0; i < ARRAY_SIZE(port_speed_str); i++) {

> +		if (port_speed_str[i].rate != ha->link_data_rate)

> +			continue;

> +		speed = port_speed_str[i].str;

> +		break;

> +	}

> +

> +	return scnprintf(buf, PAGE_SIZE, "%s\n", speed);

> }

> 

> static ssize_t

> -- 

> 2.19.0.rc0

> 


Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>


--
Himanshu Madhani	 Oracle Linux Engineering
diff mbox series

Patch

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index d09776b77af2..cb5f2ecb652d 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -1868,6 +1868,18 @@  qla2x00_port_speed_store(struct device *dev, struct device_attribute *attr,
 	return strlen(buf);
 }
 
+static const struct {
+	u16 rate;
+	char *str;
+} port_speed_str[] = {
+	{ PORT_SPEED_4GB, "4" },
+	{ PORT_SPEED_8GB, "8" },
+	{ PORT_SPEED_16GB, "16" },
+	{ PORT_SPEED_32GB, "32" },
+	{ PORT_SPEED_64GB, "64" },
+	{ PORT_SPEED_10GB, "10" },
+};
+
 static ssize_t
 qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr,
     char *buf)
@@ -1875,7 +1887,8 @@  qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr,
 	struct scsi_qla_host *vha = shost_priv(dev_to_shost(dev));
 	struct qla_hw_data *ha = vha->hw;
 	ssize_t rval;
-	char *spd[7] = {"0", "0", "0", "4", "8", "16", "32"};
+	u16 i;
+	char *speed = "Unknown";
 
 	rval = qla2x00_get_data_rate(vha);
 	if (rval != QLA_SUCCESS) {
@@ -1884,7 +1897,14 @@  qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr,
 		return -EINVAL;
 	}
 
-	return scnprintf(buf, PAGE_SIZE, "%s\n", spd[ha->link_data_rate]);
+	for (i = 0; i < ARRAY_SIZE(port_speed_str); i++) {
+		if (port_speed_str[i].rate != ha->link_data_rate)
+			continue;
+		speed = port_speed_str[i].str;
+		break;
+	}
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", speed);
 }
 
 static ssize_t