iommufd: Make sure to zero vfio_iommu_type1_info before copying to user

Missed a zero initialization here. Most of the struct is filled with
a copy_from_user(), however minsz for that copy is smaller than the
actual struct by 8 bytes, thus we don't fill the padding.

Cc: stable@vger.kernel.org # 6.1+
Fixes: d624d6652a65 ("iommufd: vfio container FD ioctl compatibility")
Link: https://lore.kernel.org/r/0-v1-a74499ece799+1a-iommufd_get_info_leak_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reported-by: syzbot+cb1e0978f6bf46b83a58@syzkaller.appspotmail.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/iommu/iommufd/vfio_compat.c b/drivers/iommu/iommufd/vfio_compat.c
index 8e38bb0..514494a 100644 (file)
--- a/drivers/iommu/iommufd/vfio_compat.c
+++ b/drivers/iommu/iommufd/vfio_compat.c
@@ -448,7 +448,7 @@ static int iommufd_vfio_iommu_get_info(struct iommufd_ctx *ictx,
        };
        size_t minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
        struct vfio_info_cap_header __user *last_cap = NULL;
-       struct vfio_iommu_type1_info info;
+       struct vfio_iommu_type1_info info = {};
        struct iommufd_ioas *ioas;
        size_t total_cap_size;
        int rc;