From bc1371c181b503fe925ae292cd96618f305790cd Mon Sep 17 00:00:00 2001 From: Pan Bian Date: Tue, 8 Aug 2017 19:40:30 +0800 Subject: [PATCH] scsi: pm8001: fix double free in pm8001_pci_probe 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 Reviewed-by: Jack Wang Signed-off-by: Martin K. Petersen --- 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 034b2f7d1135..2908881bad51 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 @@ err_out_ha_free: 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); -- 2.20.1