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scsi: qla2xxx: Fix kernel crash when accessing port_speed sysfs file 

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

Link: https://lore.kernel.org/r/20210908164622.19240-7-njavali@marvell.com
Fixes: 4910b524ac ("scsi: qla2xxx: Add support for setting port speed")
Cc: stable@vger.kernel.org
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Arun Easi 2021-09-08 09:46:18 -07:00 committed by Martin K. Petersen
parent 527d46e0b0
commit 3ef68d4f0c
1 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/scsi/qla2xxx/qla_attr.c
View File

@ -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