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kconfig/nconf: Fix hang when editing symbol with a long prompt

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Currently it is impossible to edit the value of a config symbol with a
prompt longer than (terminal width - 2) characters.  dialog_inputbox()
calculates a negative x-offset for the input window and newwin() fails
as this is invalid.  It also doesn't check for this failure, so it
busy-loops calling wgetch(NULL) which immediately returns -1.

The additions in the offset calculations also don't match the intended
size of the window.

Limit the window size and calculate the offset similarly to
show_scroll_win().

Cc: stable <stable@vger.kernel.org>
Fixes: 692d97c380 ("kconfig: new configuration interface (nconfig)")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
This commit is contained in:
Ben Hutchings 2016-11-24 22:10:23 +00:00 committed by Michal Marek
parent 0eb4734696
commit 79e51b5c2d
1 changed files with 11 additions and 4 deletions
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15
scripts/kconfig/nconf.gui.c
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@ -364,12 +364,14 @@ int dialog_inputbox(WINDOW *main_window,
WINDOW *prompt_win;
WINDOW *form_win;
PANEL *panel;
int i, x, y;
int i, x, y, lines, columns, win_lines, win_cols;
int res = -1;
int cursor_position = strlen(init);
int cursor_form_win;
char *result = *resultp;
getmaxyx(stdscr, lines, columns);
if (strlen(init)+1 > *result_len) {
*result_len = strlen(init)+1;
*resultp = result = realloc(result, *result_len);
@ -386,14 +388,19 @@ int dialog_inputbox(WINDOW *main_window,
if (title)
prompt_width = max(prompt_width, strlen(title));
win_lines = min(prompt_lines+6, lines-2);
win_cols = min(prompt_width+7, columns-2);
prompt_lines = max(win_lines-6, 0);
prompt_width = max(win_cols-7, 0);
/* place dialog in middle of screen */
y = (getmaxy(stdscr)-(prompt_lines+4))/2;
x = (getmaxx(stdscr)-(prompt_width+4))/2;
y = (lines-win_lines)/2;
x = (columns-win_cols)/2;
strncpy(result, init, *result_len);
/* create the windows */
win = newwin(prompt_lines+6, prompt_width+7, y, x);
win = newwin(win_lines, win_cols, y, x);
prompt_win = derwin(win, prompt_lines+1, prompt_width, 2, 2);
form_win = derwin(win, 1, prompt_width, prompt_lines+3, 2);
keypad(form_win, TRUE);