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mpt3sas: Ensure the connector_name string is NUL-terminated 

We blindly trust the hardware to give us NUL-terminated strings, which
is a bad idea because it doesn't always do that. For example:

  [  481.184784] mpt3sas_cm0: 	enclosure level(0x0000), connector name(     \x3)

In this case, connector_name is four spaces. We got lucky here because
the 2nd byte beyond our character array happens to be a NUL. Fix this by
explicitly writing '\0' to the end of the string to ensure we don't run
off the edge of the world in printk().

Signed-off-by: Calvin Owens <calvinowens@fb.com>
Acked-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Calvin Owens 2016-07-27 21:45:51 -07:00 committed by Martin K. Petersen
parent 29b4817d40
commit 310c8e40d5
2 changed files with 7 additions and 5 deletions
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2
drivers/scsi/mpt3sas/mpt3sas_base.h
View File

@ -478,7 +478,7 @@ struct _sas_device {
u8 pfa_led_on;
u8 pend_sas_rphy_add;
u8 enclosure_level;
u8 connector_name[4];
u8 connector_name[5];
struct kref refcount;
};

10
drivers/scsi/mpt3sas/mpt3sas_scsih.c
View File

@ -5380,8 +5380,9 @@ _scsih_check_device(struct MPT3SAS_ADAPTER *ioc,
MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
sas_device->enclosure_level =
le16_to_cpu(sas_device_pg0.EnclosureLevel);
memcpy(&sas_device->connector_name[0],
&sas_device_pg0.ConnectorName[0], 4);
memcpy(sas_device->connector_name,
sas_device_pg0.ConnectorName, 4);
sas_device->connector_name[4] = '\0';
} else {
sas_device->enclosure_level = 0;
sas_device->connector_name[0] = '\0';
@ -5508,8 +5509,9 @@ _scsih_add_device(struct MPT3SAS_ADAPTER *ioc, u16 handle, u8 phy_num,
if (sas_device_pg0.Flags & MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
sas_device->enclosure_level =
le16_to_cpu(sas_device_pg0.EnclosureLevel);
memcpy(&sas_device->connector_name[0],
&sas_device_pg0.ConnectorName[0], 4);
memcpy(sas_device->connector_name,
sas_device_pg0.ConnectorName, 4);
sas_device->connector_name[4] = '\0';
} else {
sas_device->enclosure_level = 0;
sas_device->connector_name[0] = '\0';