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authorAlex Williamson <alex.williamson@redhat.com>2013-07-01 16:28:58 +0200
committerAlex Williamson <alex.williamson@redhat.com>2013-07-01 16:28:58 +0200
commit8d38ef1948bd415a5cb653a5c0ec16f3402aaca1 (patch)
treea28c39a7e8f7b4855a4ff867051fd90297aad670 /drivers
parentvfio: Limit group opens (diff)
downloadlinux-8d38ef1948bd415a5cb653a5c0ec16f3402aaca1.tar.xz
linux-8d38ef1948bd415a5cb653a5c0ec16f3402aaca1.zip
vfio/type1: Fix leak on error path
We also don't handle unpinning zero pages as an error on other exits so we can fix that inconsistency by rolling in the next conditional return. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/vfio/vfio_iommu_type1.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 98231d10890c..a9807dea3887 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -436,6 +436,12 @@ static int vfio_remove_dma_overlap(struct vfio_iommu *iommu, dma_addr_t start,
}
/* Split existing */
+
+ /*
+ * Allocate our tracking structure early even though it may not
+ * be used. An Allocation failure later loses track of pages and
+ * is more difficult to unwind.
+ */
split = kzalloc(sizeof(*split), GFP_KERNEL);
if (!split)
return -ENOMEM;
@@ -443,12 +449,9 @@ static int vfio_remove_dma_overlap(struct vfio_iommu *iommu, dma_addr_t start,
offset = start - dma->iova;
ret = vfio_unmap_unpin(iommu, dma, start, size);
- if (ret)
- return ret;
-
- if (!*size) {
+ if (ret || !*size) {
kfree(split);
- return -EINVAL;
+ return ret;
}
tmp = dma->size;