9p: acl: fix uninitialized iattr access

[ Upstream commit e02a53d92e197706cad1627bd84705d4aa20a145 ]

iattr is passed to v9fs_vfs_setattr_dotl which does send various
values from iattr over the wire, even if it tells the server to
only look at iattr.ia_valid fields this could leak some stack data.

Link: http://lkml.kernel.org/r/1536339057-21974-2-git-send-email-asmadeus@codewreck.org
Addresses-Coverity-ID: 1195601 ("Uninitalized scalar variable")
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 082d227..6261719 100644 (file)
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -276,7 +276,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
        switch (handler->flags) {
        case ACL_TYPE_ACCESS:
                if (acl) {
-                       struct iattr iattr;
+                       struct iattr iattr = { 0 };
                        struct posix_acl *old_acl = acl;
 
                        retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);