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scripts/kconfig/nconf: fix memmove's length arg

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In case KEY_BACKSPACE / KEY_DC to delete a char, it memmove only
(len-cursor_position+1) bytes;
the default case is to insert a char, it should also memmove exactly
(len-cursor_position+1) bytes;

the original use of (len+1) is wrong and may access following memory
that doesn't belong to result, may cause SegFault in theory;

	case KEY_BACKSPACE:
		if (cursor_position > 0) {
			memmove(&result[cursor_position-1],
					&result[cursor_position],
					len-cursor_position+1);
			cursor_position--;
		}
		break;
	case KEY_DC:
		if (cursor_position >= 0 && cursor_position < len) {
			memmove(&result[cursor_position],
					&result[cursor_position+1],
					len-cursor_position+1);
		}
		break;
	default:
		if ((isgraph(res) || isspace(res)) &&
				len-2 < result_len) {
			/* insert the char at the proper position */
			memmove(&result[cursor_position+1],
					&result[cursor_position],
					len-cursor_position+1);
			result[cursor_position] = res;
			cursor_position++;
		}

Signed-off-by: Cheng Renquan <crquan@gmail.com>
Acked-by: Nir Tzachar <nir.tzachar@gmail.com>
This commit is contained in:
Cheng Renquan 2011-09-01 10:52:19 -07:00 committed by Michal Marek
parent 4e24dbfc26
commit cd58a90fa6
1 changed files with 1 additions and 1 deletions
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2
scripts/kconfig/nconf.gui.c
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@ -457,7 +457,7 @@ int dialog_inputbox(WINDOW *main_window,
/* insert the char at the proper position */
memmove(&result[cursor_position+1],
&result[cursor_position],
len+1);
len-cursor_position+1);
result[cursor_position] = res;
cursor_position++;
} else {