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mpt3sas: set num_phys after allocating phy[] space

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In _scsih_sas_host_add, the number of HBA phys are determined and then
later used to allocate an array of struct _sas_phy's.  If the routine
sets ioc->sas_hba.num_phys, but then fails to allocate the
ioc->sas_hba.phy array (by kcalloc error or other intermediate
error/exit path), ioc->sas_hba is left in a dangerous state: all readers
of ioc->sas_hba.phy[] do so by indexing it from 0..ioc->sas_hba.num_phys
without checking that the space was ever allocated.

Modify _scsih_sas_host_add to set ioc->sas_hba.num_phys only after
successfully allocating ioc->sas_hba.phy[].

Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Acked-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Joe Lawrence 2016-05-25 15:14:28 -04:00 committed by Martin K. Petersen
parent 87ee3ab928
commit 87aa95d4bb
1 changed files with 11 additions and 9 deletions
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20
drivers/scsi/mpt3sas/mpt3sas_scsih.c
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@ -4903,13 +4903,22 @@ _scsih_sas_host_add(struct MPT3SAS_ADAPTER *ioc)
u16 ioc_status;
u16 sz;
u8 device_missing_delay;
u8 num_phys;
mpt3sas_config_get_number_hba_phys(ioc, &ioc->sas_hba.num_phys);
if (!ioc->sas_hba.num_phys) {
mpt3sas_config_get_number_hba_phys(ioc, &num_phys);
if (!num_phys) {
pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
ioc->name, __FILE__, __LINE__, __func__);
return;
}
ioc->sas_hba.phy = kcalloc(num_phys,
sizeof(struct _sas_phy), GFP_KERNEL);
if (!ioc->sas_hba.phy) {
pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
ioc->name, __FILE__, __LINE__, __func__);
goto out;
}
ioc->sas_hba.num_phys = num_phys;
/* sas_iounit page 0 */
sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) + (ioc->sas_hba.num_phys *
@ -4969,13 +4978,6 @@ _scsih_sas_host_add(struct MPT3SAS_ADAPTER *ioc)
MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK;
ioc->sas_hba.parent_dev = &ioc->shost->shost_gendev;
ioc->sas_hba.phy = kcalloc(ioc->sas_hba.num_phys,
sizeof(struct _sas_phy), GFP_KERNEL);
if (!ioc->sas_hba.phy) {
pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
ioc->name, __FILE__, __LINE__, __func__);
goto out;
}
for (i = 0; i < ioc->sas_hba.num_phys ; i++) {
if ((mpt3sas_config_get_phy_pg0(ioc, &mpi_reply, &phy_pg0,
i))) {