[PATCH 1/3 v2] fs: ocfs2: Fix possible null-pointer dereferences in ocfs2_xa_prepare_entry()

[Jia-Ju Bai]

In ocfs2_xa_prepare_entry(), there is an if statement on line 2136 to
check whether loc->xl_entry is NULL:
    if (loc->xl_entry)

When loc->xl_entry is NULL, it is used on line 2158:
    ocfs2_xa_add_entry(loc, name_hash);
        loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
        loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
and line 2164:
    ocfs2_xa_add_namevalue(loc, xi);
        loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
        loc->xl_entry->xe_name_len = xi->xi_name_len;

Thus, possible null-pointer dereferences may occur.

To fix these bugs, if loc-xl_entry is NULL, ocfs2_xa_prepare_entry()
abnormally returns with -EINVAL.

These bugs are found by a static analysis tool STCheck written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
v2:
* Directly return -EINVAL if loc-xl_entry is NULL.
  Thank Joseph for helpful advice.

---
 fs/ocfs2/xattr.c | 44 +++++++++++++++++++++++---------------------
 1 file changed, 23 insertions(+), 21 deletions(-)

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 385f3aaa2448..4b876c82a35c 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -2133,29 +2133,31 @@ static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc 
*loc,
        if (rc)
                goto out;
 
-       if (loc->xl_entry) {
-               if (ocfs2_xa_can_reuse_entry(loc, xi)) {
-                       orig_value_size = loc->xl_entry->xe_value_size;
-                       rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
-                       if (rc)
-                               goto out;
-                       goto alloc_value;
-               }
+       if (!loc->xl_entry) {
+               rc = -EINVAL;
+               goto out;
+       }
 
-               if (!ocfs2_xattr_is_local(loc->xl_entry)) {
-                       orig_clusters = ocfs2_xa_value_clusters(loc);
-                       rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
-                       if (rc) {
-                               mlog_errno(rc);
-                               ocfs2_xa_cleanup_value_truncate(loc,
-                                                               "overwriting",
-                                                               orig_clusters);
-                               goto out;
-                       }
+       if (ocfs2_xa_can_reuse_entry(loc, xi)) {
+               orig_value_size = loc->xl_entry->xe_value_size;
+               rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
+               if (rc)
+                       goto out;
+               goto alloc_value;
+       }
+
+       if (!ocfs2_xattr_is_local(loc->xl_entry)) {
+               orig_clusters = ocfs2_xa_value_clusters(loc);
+               rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
+               if (rc) {
+                       mlog_errno(rc);
+                       ocfs2_xa_cleanup_value_truncate(loc,
+                                                       "overwriting",
+                                                       orig_clusters);
+                       goto out;
                }
-               ocfs2_xa_wipe_namevalue(loc);
-       } else
-               ocfs2_xa_add_entry(loc, name_hash);
+       }
+       ocfs2_xa_wipe_namevalue(loc);
 
        /*
         * If we get here, we have a blank entry.  Fill it.  We grow our
-- 
2.17.0