In function pm8001_pci_probe(), on errors that the control flow jumps to label err_out_ha_free, function pm8001_free() is called. In pm8001_free(), scsi_host_put() is called to release shost, which keeps the return value of scsi_host_alloc(). After pm8001_free() returns, kfree() is called to free shost again, resulting in a double free bug. This patch removes scsi_host_put() from pm8001_free() and explicitly calls scsi_host_put() to release Scsi_Host in need. Signed-off-by: Pan Bian <bianpan2016@xxxxxxx> --- drivers/scsi/pm8001/pm8001_init.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c index 034b2f7..2908881 100644 --- a/drivers/scsi/pm8001/pm8001_init.c +++ b/drivers/scsi/pm8001/pm8001_init.c @@ -160,8 +160,6 @@ static void pm8001_free(struct pm8001_hba_info *pm8001_ha) } } PM8001_CHIP_DISP->chip_iounmap(pm8001_ha); - if (pm8001_ha->shost) - scsi_host_put(pm8001_ha->shost); flush_workqueue(pm8001_wq); kfree(pm8001_ha->tags); kfree(pm8001_ha); @@ -1073,7 +1071,7 @@ static int pm8001_pci_probe(struct pci_dev *pdev, err_out_free: kfree(SHOST_TO_SAS_HA(shost)); err_out_free_host: - kfree(shost); + scsi_host_put(shost); err_out_regions: pci_release_regions(pdev); err_out_disable: @@ -1112,6 +1110,7 @@ static void pm8001_pci_remove(struct pci_dev *pdev) for (j = 0; j < PM8001_MAX_MSIX_VEC; j++) tasklet_kill(&pm8001_ha->tasklet[j]); #endif + scsi_host_put(pm8001_ha->shost); pm8001_free(pm8001_ha); kfree(sha->sas_phy); kfree(sha->sas_port); -- 1.9.1
