9p back-end first queries the size of an extended attribute,
allocates space for it via g_malloc() and then retrieves its
value into allocated buffer. Race between querying attribute
size and retrieving its could lead to memory bytes disclosure.
Use g_malloc0() to avoid it.
Reported-by: Tuomas Tynkkynen <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/9pfs/9p.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 23ac7bb532..f8bbac251d 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3234,7 +3234,7 @@ static void coroutine_fn v9fs_xattrwalk(void *opaque)
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.xattrwalk_fid = true;
if (size) {
- xattr_fidp->fs.xattr.value = g_malloc(size);
+ xattr_fidp->fs.xattr.value = g_malloc0(size);
err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
xattr_fidp->fs.xattr.value,
xattr_fidp->fs.xattr.len);
@@ -3267,7 +3267,7 @@ static void coroutine_fn v9fs_xattrwalk(void *opaque)
xattr_fidp->fid_type = P9_FID_XATTR;
xattr_fidp->fs.xattr.xattrwalk_fid = true;
if (size) {
- xattr_fidp->fs.xattr.value = g_malloc(size);
+ xattr_fidp->fs.xattr.value = g_malloc0(size);
err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
&name, xattr_fidp->fs.xattr.value,
xattr_fidp->fs.xattr.len);
--
2.13.6