CIFS: Fix a possible memory corruption during reconnect

[firefly-linux-kernel-4.4.55.git] / fs / cachefiles / namei.c

diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index fc1056f5c96a3c750c3c5c9009048b234a7fd745..c4b893453e0eefda8475b3537e934f2bfc46d268 100644 (file)
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -655,6 +655,8 @@ lookup_again:
                        aops = d_backing_inode(object->dentry)->i_mapping->a_ops;
                        if (!aops->bmap)
                                goto check_error;
+                       if (object->dentry->d_sb->s_blocksize > PAGE_SIZE)
+                               goto check_error;
 
                        object->backer = object->dentry;
                } else {