Revert "udf: prevent speculative execution"

CVE-2017-5753 (revert embargoed)
CVE-2017-5715 (revert embargoed)

This reverts commit eccbd5ac.
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

fs/udf/misc.c

@@ -104,8 +104,6 @@ struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size,
 					iinfo->i_lenEAttr) {
 				uint32_t aal =
 					le32_to_cpu(eahd->appAttrLocation);
-
-				gmb();
 				memmove(&ea[offset - aal + size],
 					&ea[aal], offset - aal);
 				offset -= aal;
@@ -116,8 +114,6 @@ struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size,
 					iinfo->i_lenEAttr) {
 				uint32_t ial =
 					le32_to_cpu(eahd->impAttrLocation);
-
-				gmb();
 				memmove(&ea[offset - ial + size],
 					&ea[ial], offset - ial);
 				offset -= ial;
@@ -129,8 +125,6 @@ struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size,
 					iinfo->i_lenEAttr) {
 				uint32_t aal =
 					le32_to_cpu(eahd->appAttrLocation);
-
-				gmb();
 				memmove(&ea[offset - aal + size],
 					&ea[aal], offset - aal);
 				offset -= aal;