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| author |   James Smart <jsmart2021@gmail.com> | 2019-11-21 09:55:56 -0800 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-11-21 20:49:50 -0500 |
| commit | eede4970fb6c29f2056d7d016a3764c90e9d8a65 (patch) | |
| tree | fa89560199df9329090780bec49e12583854b71d /drivers/scsi/scsi_transport_sas.c | |
| parent | scsi: ibmvscsi_tgt: Remove unneeded variable rc (diff) | |
| download | linux-dev-eede4970fb6c29f2056d7d016a3764c90e9d8a65.tar.xz linux-dev-eede4970fb6c29f2056d7d016a3764c90e9d8a65.zip | |
scsi: lpfc: size cpu map by last cpu id set
Currently the lpfc driver sizes its cpu_map array based on
num_possible_cpus(). However, that can be a value that is less than the
highest cpu id bit that is set. As such, if a thread runs on a cpu with a
larger cpu id, or for_each_possible_cpu() is used, the driver could index
off the end of the array and return garbage or GPF.
The driver maintains its own internal copy of the "num_possible" cpu value
and sizes arrays by it.
Fix by setting the driver's value to the value of the last cpu id bit set
in the possible_mask - plus 1. Thus cpu_map will be sized to allow access
by any cpu id possible.
Link: https://lore.kernel.org/r/20191121175556.18953-1-jsmart2021@gmail.com
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions