[Qemu-devel] [PATCH 2/2] 9pfs: fix memory leak about xattr value

[Li Qiang]

From: Li Qiang <liqiang...@360.cn>

The 'fs.xattr.value' field in V9fsFidState object doesn't consider
the situation that this field has been allocated previously. Every
time, it will be allocated directly. This leads a  host memory leak
issue. This patch fix this.

Signed-off-by: Li Qiang <liqiang...@360.cn>
---
 hw/9pfs/9p.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 8751c19..3af23f9 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -350,6 +350,7 @@ free_out:
     v9fs_string_free(&fidp->fs.xattr.name);
 free_value:
     g_free(fidp->fs.xattr.value);
+    fidp->fs.xattr.value = NULL;
     return retval;
 }
 
@@ -3191,7 +3192,8 @@ static void v9fs_xattrwalk(void *opaque)
         xattr_fidp->fid_type = P9_FID_XATTR;
         xattr_fidp->fs.xattr.copied_len = -1;
         if (size) {
-            xattr_fidp->fs.xattr.value = g_malloc(size);
+            xattr_fidp->fs.xattr.value = g_realloc(
+                xattr_fidp->fs.xattr.value, size);
             err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
                                      xattr_fidp->fs.xattr.value,
                                      xattr_fidp->fs.xattr.len);
@@ -3224,7 +3226,8 @@ static void v9fs_xattrwalk(void *opaque)
         xattr_fidp->fid_type = P9_FID_XATTR;
         xattr_fidp->fs.xattr.copied_len = -1;
         if (size) {
-            xattr_fidp->fs.xattr.value = g_malloc(size);
+            xattr_fidp->fs.xattr.value = g_realloc(
+                xattr_fidp->fs.xattr.value, size);
             err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
                                     &name, xattr_fidp->fs.xattr.value,
                                     xattr_fidp->fs.xattr.len);
-- 
1.8.3.1