[Qemu-devel] [PATCH] 9pfs: fix information leak in xattr read

[Li Qiang <liq3ea@gmail.com>]

From: Li Qiang <liqiang6-s@360.cn>

9pfs uses g_malloc() to allocate the xattr memory space, if the guest
reads this memory before writing to it, this will leak host heap
memory to the guest. This patch avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
---
 hw/9pfs/9p.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index b1ff8e7..4db1bd8 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3291,7 +3291,7 @@ static void v9fs_xattrcreate(void *opaque)
     xattr_fidp->fs.xattr.flags = flags;
     v9fs_string_init(&xattr_fidp->fs.xattr.name);
     v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
-    xattr_fidp->fs.xattr.value = g_malloc(size);
+    xattr_fidp->fs.xattr.value = g_malloc0(size);
     err = offset;
     put_fid(pdu, file_fidp);
 out_nofid:
-- 
1.8.3.1