[PATCH] scsi: mpt3sas: fix potential use-after-free in mpt3sas_base_attach

[Dinghao Liu]

_base_allocate_memory_pools() calls _base_release_memory_pools()
to clean up memory in several error paths. However,
mpt3sas_base_attach() calls _base_release_memory_pools() again
on failure of _base_allocate_memory_pools(), which may lead to
use-after-free.

Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index a75f670bf551..9be7e493e56c 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -5844,6 +5844,7 @@ _base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
 		}
 		dma_pool_destroy(ioc->reply_post_free_array_dma_pool);
 		kfree(ioc->reply_post);
+		ioc->reply_post = NULL;
 	}
 
 	if (ioc->pcie_sgl_dma_pool) {
@@ -5854,6 +5855,7 @@ _base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
 			ioc->pcie_sg_lookup[i].pcie_sgl = NULL;
 		}
 		dma_pool_destroy(ioc->pcie_sgl_dma_pool);
+		ioc->pcie_sgl_dma_pool = NULL;
 	}
 	kfree(ioc->pcie_sg_lookup);
 	ioc->pcie_sg_lookup = NULL;
@@ -5864,6 +5866,7 @@ _base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
 				     ioc->config_page));
 		dma_free_coherent(&ioc->pdev->dev, ioc->config_page_sz,
 		    ioc->config_page, ioc->config_page_dma);
+		ioc->config_page = NULL;
 	}
 
 	kfree(ioc->hpr_lookup);
-- 
2.17.1