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| author | Sreekanth Reddy <sreekanth.reddy@broadcom.com> | 2021-11-17 16:19:09 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-01 09:27:42 +0100 |
| commit | 0d4b29eaadc1f59cec0c7e85eae77d08fcca9824 (patch) | |
| tree | abd900986806887c444eed6155b7a22632b64d2c | |
| parent | 33712bc6482ef9e4ac13835ebe20f77b4984a8aa (diff) | |
| download | linux-stable-0d4b29eaadc1f59cec0c7e85eae77d08fcca9824.tar.gz linux-stable-0d4b29eaadc1f59cec0c7e85eae77d08fcca9824.tar.bz2 linux-stable-0d4b29eaadc1f59cec0c7e85eae77d08fcca9824.zip | |
scsi: mpt3sas: Fix kernel panic during drive powercycle test
[ Upstream commit 0ee4ba13e09c9d9c1cb6abb59da8295d9952328b ]
While looping over shost's sdev list it is possible that one
of the drives is getting removed and its sas_target object is
freed but its sdev object remains intact.
Consequently, a kernel panic can occur while the driver is trying to access
the sas_address field of sas_target object without also checking the
sas_target object for NULL.
Link: https://lore.kernel.org/r/20211117104909.2069-1-sreekanth.reddy@broadcom.com
Fixes: f92363d12359 ("[SCSI] mpt3sas: add new driver supporting 12GB SAS")
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_scsih.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c index add699b01836..d899f216245e 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c @@ -3364,7 +3364,7 @@ _scsih_ublock_io_device(struct MPT3SAS_ADAPTER *ioc, u64 sas_address) shost_for_each_device(sdev, ioc->shost) { sas_device_priv_data = sdev->hostdata; - if (!sas_device_priv_data) + if (!sas_device_priv_data || !sas_device_priv_data->sas_target) continue; if (sas_device_priv_data->sas_target->sas_address != sas_address) |