File 0119-9pfs-add-cleanup-operation-in-FileO.patch of Package qemu.19799

From: Li Qiang <liq3ea@gmail.com>
Date: Wed, 23 Nov 2016 13:53:34 +0100
Subject: 9pfs: add cleanup operation in FileOperations

Currently, the backend of VirtFS doesn't have a cleanup
function. This will lead resource leak issues if the backed
driver allocates resources. This patch addresses this issue.

Signed-off-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Greg Kurz <groug@kaod.org>
(cherry picked from commit 702dbcc274e2ca43be20ba64c758c0ca57dab91d)
[BR: CVE-2016-9913 BSC#1014110]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 fsdev/file-op-9p.h | 1 +
 hw/9pfs/9p.c       | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
index b8c26024a9555f27f6503ef3f159..0681021028e9db9c2b8b37c04704 100644
--- a/fsdev/file-op-9p.h
+++ b/fsdev/file-op-9p.h
@@ -99,6 +99,7 @@ struct FileOperations
 {
     int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
     int (*init)(struct FsContext *);
+    void (*cleanup)(struct FsContext *);
     int (*lstat)(FsContext *, V9fsPath *, struct stat *);
     ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
     int (*chmod)(FsContext *, V9fsPath *, FsCred *);
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index dd39bc1851c1f7b464dbd9735118..fd20a4be23bb3d24d8275b9b12d6 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3480,6 +3480,9 @@ int v9fs_device_realize_common(V9fsState *s, Error **errp)
     rc = 0;
 out:
     if (rc) {
+        if (s->ops->cleanup && s->ctx.private) {
+            s->ops->cleanup(&s->ctx);
+        }
         g_free(s->tag);
         g_free(s->ctx.fs_root);
         v9fs_path_free(&path);
@@ -3489,6 +3492,9 @@ out:
 
 void v9fs_device_unrealize_common(V9fsState *s, Error **errp)
 {
+    if (s->ops->cleanup) {
+        s->ops->cleanup(&s->ctx);
+    }
     g_free(s->tag);
     g_free(s->ctx.fs_root);
 }