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-rw-r--r--fs/ubifs/recovery.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index fe7af9f676b..e5f6cf8a115 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -53,6 +53,25 @@ static int is_empty(void *buf, int len)
}
/**
+ * first_non_ff - find offset of the first non-0xff byte.
+ * @buf: buffer to search in
+ * @len: length of buffer
+ *
+ * This function returns offset of the first non-0xff byte in @buf or %-1 if
+ * the buffer contains only 0xff bytes.
+ */
+static int first_non_ff(void *buf, int len)
+{
+ uint8_t *p = buf;
+ int i;
+
+ for (i = 0; i < len; i++)
+ if (*p++ != 0xff)
+ return i;
+ return -1;
+}
+
+/**
* get_master_node - get the last valid master node allowing for corruption.
* @c: UBIFS file-system description object
* @lnum: LEB number
@@ -649,8 +668,13 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
clean_buf(c, &buf, lnum, &offs, &len);
need_clean = 1;
} else {
- ubifs_err("corrupt empty space at LEB %d:%d",
- lnum, offs);
+ int corruption = first_non_ff(buf, len);
+
+ ubifs_err("corrupt empty space LEB %d:%d, corruption "
+ "starts at %d", lnum, offs, corruption);
+ /* Make sure we dump interesting non-0xFF data */
+ offs = corruption;
+ buf += corruption;
goto corrupted;
}
}