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vim-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.
7ce5b2b590
This commit is contained in:
zeertzjq
2022-05-17 08:10:34 +08:00
parent 26c906f54d
commit 527e861cbb
4 changed files with 34 additions and 7 deletions
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18
src/nvim/cursor.c
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@@ -399,6 +399,24 @@ void 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;
}
}
}
/// Make sure curwin->w_cursor is not on the NUL at the end of the line.
/// Allow it when in Visual mode and 'selection' is not "old".
void adjust_cursor_col(void)