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patch 8.2.4763: using invalid pointer with "V:" in Ex mode

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Problem:    Using invalid pointer with "V:" in Ex mode.
Solution:   Correctly handle the command being changed to "+".
This commit is contained in:
Bram Moolenaar
2022-04-16 18:52:17 +01:00
parent ca7e86c237
commit f50808ed13
3 changed files with 39 additions and 5 deletions
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29
src/ex_docmd.c
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@@ -2783,7 +2783,9 @@ parse_command_modifiers(
cmdmod_T *cmod,
int skip_only)
{
char_u *orig_cmd = eap->cmd;
char_u *cmd_start = NULL;
int did_plus_cmd = FALSE;
char_u *p;
int starts_with_colon = FALSE;
int vim9script = in_vim9script();
@@ -2819,6 +2821,7 @@ parse_command_modifiers(
&& curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count)
{
eap->cmd = (char_u *)"+";
did_plus_cmd = TRUE;
if (!skip_only)
ex_pressedreturn = TRUE;
}
@@ -3105,13 +3108,29 @@ parse_command_modifiers(
// Since the modifiers have been parsed put the colon on top of the
// space: "'<,'>mod cmd" -> "mod:'<,'>cmd
// Put eap->cmd after the colon.
mch_memmove(cmd_start - 5, cmd_start, eap->cmd - cmd_start);
eap->cmd -= 5;
mch_memmove(eap->cmd - 1, ":'<,'>", 6);
if (did_plus_cmd)
{
size_t len = STRLEN(cmd_start);
// Special case: empty command may have been changed to "+":
// "'<,'>mod" -> "mod'<,'>+
mch_memmove(orig_cmd, cmd_start, len);
STRCPY(orig_cmd + len, "'<,'>+");
}
else
{
mch_memmove(cmd_start - 5, cmd_start, eap->cmd - cmd_start);
eap->cmd -= 5;
mch_memmove(eap->cmd - 1, ":'<,'>", 6);
}
}
else
// no modifiers, move the pointer back
eap->cmd -= 5;
// No modifiers, move the pointer back.
// Special case: empty command may have been changed to "+".
if (did_plus_cmd)
eap->cmd = (char_u *)"'<,'>+";
else
eap->cmd = orig_cmd;
}
return OK;