From: Sebastian Ott <sebott@linux.vnet.ibm.com>
Date: Fri, 15 Apr 2016 07:41:35 +0000 (+0200)
Subject: s390/pci: fix use after free in dma_init
X-Git-Tag: v3.10.107~77
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab6c86a0042d93b3ca15bbea29e22266a85a400f;p=linux

s390/pci: fix use after free in dma_init

commit dba599091c191d209b1499511a524ad9657c0e5a upstream.

After a failure during registration of the dma_table (because of the
function being in error state) we free its memory but don't reset the
associated pointer to zero.

When we then receive a notification from firmware (about the function
being in error state) we'll try to walk and free the dma_table again.

Fix this by resetting the dma_table pointer. In addition to that make
sure that we free the iommu_bitmap when appropriate.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---

diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index f8e69d5bc0a9..aae199b3e046 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -416,7 +416,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
 	zdev->dma_table = dma_alloc_cpu_table();
 	if (!zdev->dma_table) {
 		rc = -ENOMEM;
-		goto out_clean;
+		goto out;
 	}
 
 	zdev->iommu_size = (unsigned long) high_memory - PAGE_OFFSET;
@@ -429,7 +429,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
 						       bitmap_order);
 	if (!zdev->iommu_bitmap) {
 		rc = -ENOMEM;
-		goto out_reg;
+		goto free_dma_table;
 	}
 
 	rc = zpci_register_ioat(zdev,
@@ -438,12 +438,16 @@ int zpci_dma_init_device(struct zpci_dev *zdev)
 				zdev->start_dma + zdev->iommu_size - 1,
 				(u64) zdev->dma_table);
 	if (rc)
-		goto out_reg;
-	return 0;
+		goto free_bitmap;
 
-out_reg:
+	return 0;
+free_bitmap:
+	vfree(zdev->iommu_bitmap);
+	zdev->iommu_bitmap = NULL;
+free_dma_table:
 	dma_free_cpu_table(zdev->dma_table);
-out_clean:
+	zdev->dma_table = NULL;
+out:
 	return rc;
 }