1 files changed, 9 insertions, 3 deletions

diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 054363f2b207..01682713af69 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -62,6 +62,7 @@ void ubifs_ro_mode(struct ubifs_info *c, int err)
 {
         if (!c->ro_media) {
                 c->ro_media = 1;
+                c->no_chk_data_crc = 0;
                 ubifs_warn("switched to read-only mode, error %d", err);
                 dbg_dump_stack();
         }
@@ -74,6 +75,7 @@ void ubifs_ro_mode(struct ubifs_info *c, int err)
  * @lnum: logical eraseblock number
  * @offs: offset within the logical eraseblock
  * @quiet: print no messages
+ * @chk_crc: indicates whether to always check the CRC
  *
  * This function checks node magic number and CRC checksum. This function also
  * validates node length to prevent UBIFS from becoming crazy when an attacker
@@ -85,7 +87,7 @@ void ubifs_ro_mode(struct ubifs_info *c, int err)
  * or magic.
  */
 int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
-                     int offs, int quiet)
+                     int offs, int quiet, int chk_crc)
 {
         int err = -EINVAL, type, node_len;
         uint32_t crc, node_crc, magic;
@@ -121,6 +123,10 @@ int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
                    node_len > c->ranges[type].max_len)
                 goto out_len;
 
+        if (!chk_crc && type == UBIFS_DATA_NODE && !c->always_chk_crc)
+                if (c->no_chk_data_crc)
+                        return 0;
+
         crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
         node_crc = le32_to_cpu(ch->crc);
         if (crc != node_crc) {
@@ -722,7 +728,7 @@ int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
                 goto out;
         }
 
-        err = ubifs_check_node(c, buf, lnum, offs, 0);
+        err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
         if (err) {
                 ubifs_err("expected node type %d", type);
                 return err;
@@ -781,7 +787,7 @@ int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
                 goto out;
         }
 
-        err = ubifs_check_node(c, buf, lnum, offs, 0);
+        err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
         if (err) {
                 ubifs_err("expected node type %d", type);
                 return err;