ocfs2: add inline inode consistency check to ocfs2_validate_inode_block()

In 'ocfs2_validate_inode_block()', add an extra check whether an inode
with inline data (i.e. self-contained) has no clusters, thus preventing
an invalid inode from being passed to 'ocfs2_evict_inode()' and below.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Antipov <[e-mail]>
Reported-by: [e-mail]
Closes: https://syzkaller.appspot.com/bug?extid=c16daba279a1161acfb0
Reviewed-by: Joseph Qi <[e-mail]>
Cc: Joseph Qi <[e-mail]>
Cc: Mark Fasheh <[e-mail]>
Cc: Joel Becker <[e-mail]>
Cc: Junxiao Bi <[e-mail]>
Cc: Changwei Ge <[e-mail]>
Cc: Jun Piao <[e-mail]>
Cc: Heming Zhao <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

fs/ocfs2/inode.c

···
 		goto bail;
 	}
 
+	if ((le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL) &&
+	    le32_to_cpu(di->i_clusters)) {
+		rc = ocfs2_error(sb, "Invalid dinode %llu: %u clusters\n",
+				 (unsigned long long)bh->b_blocknr,
+				 le32_to_cpu(di->i_clusters));
+		goto bail;
+	}
+
 	rc = 0;
 
 bail: