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patch 8.2.4969: changing text in Visual mode may cause invalid memory access

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Problem:    Changing text in Visual mode may cause invalid memory access.
Solution:   Check the Visual position after making a change.
This commit is contained in:
Bram Moolenaar
2022-05-16 19:40:59 +01:00
parent 60ae0e7149
commit 7ce5b2b590
6 changed files with 44 additions and 11 deletions
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27
src/misc2.c
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@@ -622,6 +622,31 @@ check_cursor(void)
check_cursor_col();
}
/*
* Check if VIsual position is valid, correct it if not.
* Can be called when in Visual mode and a change has been made.
*/
void
check_visual_pos(void)
{
if (VIsual.lnum > curbuf->b_ml.ml_line_count)
{
VIsual.lnum = curbuf->b_ml.ml_line_count;
VIsual.col = 0;
VIsual.coladd = 0;
}
else
{
int len = (int)STRLEN(ml_get(VIsual.lnum));
if (VIsual.col > len)
{
VIsual.col = len;
VIsual.coladd = 0;
}
}
}
#if defined(FEAT_TEXTOBJ) || defined(PROTO)
/*
* Make sure curwin->w_cursor is not on the NUL at the end of the line.
@@ -2416,7 +2441,7 @@ get_user_name(char_u *buf, int len)
return OK;
}
#if defined(EXITFREE) || defined(PROTOS)
#if defined(EXITFREE) || defined(PROTO)
/*
* Free the memory allocated by get_user_name()
*/