Patch 8.2.3674
Problem:    When ml_get_buf() fails it messes up IObuff.
Solution:   Return a local pointer. (closes #9214)
Files:      src/memline.c


*** ../vim-8.2.3673/src/memline.c       2021-10-19 22:12:21.936582330 +0100
--- src/memline.c       2021-11-25 13:52:07.223678254 +0000
***************
*** 2606,2611 ****
--- 2606,2612 ----
      bhdr_T    *hp;
      DATA_BL   *dp;
      static int        recursive = 0;
+     static char_u questions[4];
  
      if (lnum > buf->b_ml.ml_line_count)       // invalid line number
      {
***************
*** 2618,2626 ****
            --recursive;
        }
  errorret:
!       STRCPY(IObuff, "???");
        buf->b_ml.ml_line_len = 4;
!       return IObuff;
      }
      if (lnum <= 0)                    // pretend line 0 is line 1
        lnum = 1;
--- 2619,2627 ----
            --recursive;
        }
  errorret:
!       STRCPY(questions, "???");
        buf->b_ml.ml_line_len = 4;
!       return questions;
      }
      if (lnum <= 0)                    // pretend line 0 is line 1
        lnum = 1;
*** ../vim-8.2.3673/src/version.c       2021-11-25 13:39:22.595524952 +0000
--- src/version.c       2021-11-25 13:52:18.387677464 +0000
***************
*** 759,760 ****
--- 759,762 ----
  {   /* Add new patch number below this line */
+ /**/
+     3674,
  /**/

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