patch 8.1.1395: saving for undo may access invalid memory
Problem: Saving for undo may access invalid memory. (Dominique Pelle)
Solution: Set ml_line_len also when returning a constant string.
diff --git a/src/memline.c b/src/memline.c
index 35b524e..8416257 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -2573,13 +2573,17 @@
}
errorret:
STRCPY(IObuff, "???");
+ buf->b_ml.ml_line_len = 4;
return IObuff;
}
- if (lnum <= 0) /* pretend line 0 is line 1 */
+ if (lnum <= 0) // pretend line 0 is line 1
lnum = 1;
- if (buf->b_ml.ml_mfp == NULL) /* there are no lines */
+ if (buf->b_ml.ml_mfp == NULL) // there are no lines
+ {
+ buf->b_ml.ml_line_len = 1;
return (char_u *)"";
+ }
/*
* See if it is the same line as requested last time.