From 87aa95d4bb77613acaed9724efe07dde9e9bacd7 Mon Sep 17 00:00:00 2001 From: Joe Lawrence Date: Wed, 25 May 2016 15:14:28 -0400 Subject: [PATCH] mpt3sas: set num_phys after allocating phy[] space 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 Acked-by: Sreekanth Reddy Signed-off-by: Martin K. Petersen --- drivers/scsi/mpt3sas/mpt3sas_scsih.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c index 6bff13e7afc7..cd6be7be0c5b 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c @@ -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))) { -- 2.20.1