Dan - I fixed the issue about a couple weeks ago in the in-house drivers. From _base_get_ioc_facts, we should be memset'ing the "struct mpt2sas_facts" instead of "Mpi2IOCFactsReply_t ", because the its four bytes larger, the ioc->pfacts is getting set to NULL. Nagalaksmi will pick it up this fix and post upstream in a future patch.
Thankyou,
Eric
________________________________________
From: linux-scsi-owner@xxxxxxxxxxxxxxx [linux-scsi-owner@xxxxxxxxxxxxxxx] On Behalf Of Dan Carpenter [dan.carpenter@xxxxxxxxxx]
Sent: Monday, February 20, 2012 7:05 AM
To: Desai, Kashyap
Cc: linux-scsi@xxxxxxxxxxxxxxx
Subject: re: [SCSI] mpt2sas: Fixed Big Indian Issues on 32 bit PPC
Hello Kashyap, Desai,
The patch c97951ec46d4: "[SCSI] mpt2sas: Fixed Big Indian Issues on
32 bit PPC" from Jun 14, 2011, leads to the following static checker
warning:
drivers/scsi/mpt2sas/mpt2sas_base.c:3352 _base_get_port_facts()
warn: are we memsetting too much? 6 vs 28
We changed the size of certain data structures.
- Mpi2IOCFactsReply_t facts;
- Mpi2PortFactsReply_t *pfacts;
+ struct mpt2sas_facts facts;
+ struct mpt2sas_port_facts *pfacts;
But it's not done consistently. We still memset it as if it were the
original size.
memset(facts, 0, sizeof(Mpi2IOCFactsReply_t));
And we still allocate the original size data structure:
4270 ioc->pfacts = kcalloc(ioc->facts.NumberOfPorts,
4271 sizeof(Mpi2PortFactsReply_t), GFP_KERNEL);
There are a couple other warnings as well.
drivers/scsi/mpt2sas/mpt2sas_base.c:3394 _base_get_ioc_facts(24)
warn: are we memsetting too much? 60 vs 64
drivers/scsi/mpt2sas/mpt2sas_base.c:4270 mpt2sas_base_attach(56)
warn: double check that we're allocating correct size: 6 vs 28
Obviously the concern with a too big memset is that we're corrupting
the next element in the array or we're corrupting past the end of the
array.
regards,
dan carpenter
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
