Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.10 1/2] scsi: lpfc: Fix a possible data race in lpfc_unregister_fcf_rescan() | Date | Thu, 3 Aug 2023 09:03:47 -0400 |
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From: Tuo Li <islituo@gmail.com>
[ Upstream commit 0e881c0a4b6146b7e856735226208f48251facd8 ]
The variable phba->fcf.fcf_flag is often protected by the lock phba->hbalock() when is accessed. Here is an example in lpfc_unregister_fcf_rescan():
spin_lock_irq(&phba->hbalock); phba->fcf.fcf_flag |= FCF_INIT_DISC; spin_unlock_irq(&phba->hbalock);
However, in the same function, phba->fcf.fcf_flag is assigned with 0 without holding the lock, and thus can cause a data race:
phba->fcf.fcf_flag = 0;
To fix this possible data race, a lock and unlock pair is added when accessing the variable phba->fcf.fcf_flag.
Reported-by: BassCheck <bass@buaa.edu.cn> Signed-off-by: Tuo Li <islituo@gmail.com> Link: https://lore.kernel.org/r/20230630024748.1035993-1-islituo@gmail.com Reviewed-by: Justin Tee <justin.tee@broadcom.com> Reviewed-by: Laurence Oberman <loberman@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/scsi/lpfc/lpfc_hbadisc.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 68ff233f936e5..3ff76ca147a5a 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -6790,7 +6790,9 @@ lpfc_unregister_fcf_rescan(struct lpfc_hba *phba) if (rc) return; /* Reset HBA FCF states after successful unregister FCF */ + spin_lock_irq(&phba->hbalock); phba->fcf.fcf_flag = 0; + spin_unlock_irq(&phba->hbalock); phba->fcf.current_rec.flag = 0; /* -- 2.40.1
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