ocfs2: Check search result in ocfs2_xattr_block_get()

ocfs2_xattr_block_get() calls ocfs2_xattr_search() to find an external
xattr, but doesn't check the search result that is passed back via struct
ocfs2_xattr_search. Add a check for search result, and pass back -ENODATA if
the xattr search failed. This avoids a later NULL pointer error.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 70baffeb1812..054e2efb0b7e 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -777,6 +777,11 @@ static int ocfs2_xattr_block_get(struct inode *inode,
                 goto cleanup;
         }
 
+        if (xs->not_found) {
+                ret = -ENODATA;
+                goto cleanup;
+        }
+
         xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
         size = le64_to_cpu(xs->here->xe_value_size);
         if (buffer) {
@@ -860,7 +865,7 @@ static int ocfs2_xattr_get(struct inode *inode,
         down_read(&oi->ip_xattr_sem);
         ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
                                     buffer_size, &xis);
-        if (ret == -ENODATA)
+        if (ret == -ENODATA && di->i_xattr_loc)
                 ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
                                             buffer_size, &xbs);
         up_read(&oi->ip_xattr_sem);