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[SCSI] mpt2sas: Fix for panic happening because of improper memory allocation

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The ioc->pfacts member in the IOC structure is getting set to zero
following a call to _base_get_ioc_facts due to the memset in that routine.
So if the ioc->pfacts was read after a host reset, there would be a NULL
pointer dereference. The routine _base_get_ioc_facts is called from context
of host reset.  The problem in _base_get_ioc_facts  is the size of
Mpi2IOCFactsReply is 64, whereas the sizeof "struct mpt2sas_facts" is 60,
so there is a four byte overflow resulting from the memset.

Also, there is memset in _base_get_port_facts using the incorrect structure,
it should be "struct mpt2sas_port_facts" instead of Mpi2PortFactsReply.

Signed-off-by: Nagalakshmi Nandigama <nagalakshmi.nandigama@lsi.com>
CC: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
nagalakshmi.nandigama@lsi.com 2012-03-20 12:10:01 +05:30 committed by James Bottomley
parent 39af7a9894
commit e42fafc25f
1 changed files with 3 additions and 3 deletions
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6
drivers/scsi/mpt2sas/mpt2sas_base.c
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@ -3350,7 +3350,7 @@ _base_get_port_facts(struct MPT2SAS_ADAPTER *ioc, int port, int sleep_flag)
}
pfacts = &ioc->pfacts[port];
memset(pfacts, 0, sizeof(Mpi2PortFactsReply_t));
memset(pfacts, 0, sizeof(struct mpt2sas_port_facts));
pfacts->PortNumber = mpi_reply.PortNumber;
pfacts->VP_ID = mpi_reply.VP_ID;
pfacts->VF_ID = mpi_reply.VF_ID;
@ -3392,7 +3392,7 @@ _base_get_ioc_facts(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
}
facts = &ioc->facts;
memset(facts, 0, sizeof(Mpi2IOCFactsReply_t));
memset(facts, 0, sizeof(struct mpt2sas_facts));
facts->MsgVersion = le16_to_cpu(mpi_reply.MsgVersion);
facts->HeaderVersion = le16_to_cpu(mpi_reply.HeaderVersion);
facts->VP_ID = mpi_reply.VP_ID;
@ -4270,7 +4270,7 @@ mpt2sas_base_attach(struct MPT2SAS_ADAPTER *ioc)
goto out_free_resources;
ioc->pfacts = kcalloc(ioc->facts.NumberOfPorts,
sizeof(Mpi2PortFactsReply_t), GFP_KERNEL);
sizeof(struct mpt2sas_port_facts), GFP_KERNEL);
if (!ioc->pfacts) {
r = -ENOMEM;
goto out_free_resources;