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comctl32/edit: Avoid division by zero during initialization. 

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=48803
Signed-off-by: Roman Pišl <rpisl@seznam.cz>
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Roman Pišl 2020-04-20 12:20:12 +02:00 committed by Alexandre Julliard
parent e2bcbdebd6
commit 571489fde1
2 changed files with 68 additions and 2 deletions
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4
dlls/comctl32/edit.c
View File

@ -406,7 +406,7 @@ static SCRIPT_STRING_ANALYSIS EDIT_UpdateUniscribeData(EDITSTATE *es, HDC dc, IN
static inline INT get_vertical_line_count(EDITSTATE *es)
{
INT vlc = (es->format_rect.bottom - es->format_rect.top) / es->line_height;
INT vlc = es->line_height ? (es->format_rect.bottom - es->format_rect.top) / es->line_height : 0;
return max(1,vlc);
}
@ -1543,7 +1543,7 @@ static void EDIT_UpdateScrollInfo(EDITSTATE *es)
si.fMask = SIF_PAGE | SIF_POS | SIF_RANGE | SIF_DISABLENOSCROLL;
si.nMin = 0;
si.nMax = es->line_count - 1;
si.nPage = (es->format_rect.bottom - es->format_rect.top) / es->line_height;
si.nPage = es->line_height ? (es->format_rect.bottom - es->format_rect.top) / es->line_height : 0;
si.nPos = es->y_offset;
TRACE("SB_VERT, nMin=%d, nMax=%d, nPage=%d, nPos=%d\n",
si.nMin, si.nMax, si.nPage, si.nPos);

66
dlls/comctl32/tests/edit.c
View File

@ -1768,6 +1768,71 @@ static BOOL is_font_installed(const char*name)
return ret;
}
static WNDPROC orig_class_proc;
static LRESULT CALLBACK test_class_proc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
RECT rect;
LRESULT result, r;
switch (message)
{
case WM_NCCREATE:
result = CallWindowProcA(orig_class_proc, hwnd, message, wParam, lParam);
memset(&rect, 0, sizeof(rect));
SendMessageA(hwnd, EM_GETRECT, 0, (LPARAM)&rect);
ok(!rect.right && !rect.bottom, "Invalid size after NCCREATE: %d x %d\n", rect.right, rect.bottom);
/* test that messages between WM_NCCREATE and WM_CREATE
don't crash or cause unexpected behavior */
r = SendMessageA(hwnd, EM_SETSEL, 0, 0);
ok(r == 1, "Returned %ld, expected 1.\n", r);
r = SendMessageA(hwnd, WM_SIZE, 0, 0x00100010);
todo_wine ok(r == 1, "Returned %ld, expected 1.\n", r);
return result;
case WM_CREATE:
/* test that messages between WM_NCCREATE and WM_CREATE
don't crash or cause unexpected behavior */
r = SendMessageA(hwnd, EM_SETSEL, 0, 0);
ok(r == 1, "Returned %ld, expected 1.\n", r);
r = SendMessageA(hwnd, WM_SIZE, 0, 0x00100010);
todo_wine ok(r == 1, "Returned %ld, expected 1.\n", r);
break;
}
return CallWindowProcA(orig_class_proc, hwnd, message, wParam, lParam);
}
static void test_initialization(void)
{
BOOL ret;
ATOM atom;
HWND hwEdit;
WNDCLASSA cls;
ret = GetClassInfoA(NULL, "Edit", &cls);
ok(ret, "Failed to get class info.\n");
orig_class_proc = cls.lpfnWndProc;
cls.lpfnWndProc = test_class_proc;
cls.lpszClassName = "TestClassName";
atom = RegisterClassA(&cls);
ok(atom != 0, "Failed to register class.\n");
hwEdit = CreateWindowExA(0, (LPCSTR)MAKEINTATOM(atom), "Text Text",
ES_MULTILINE | WS_BORDER | ES_AUTOHSCROLL | ES_AUTOVSCROLL | WS_VSCROLL,
10, 10, 300, 300, NULL, NULL, hinst, NULL);
ok(hwEdit != NULL, "Failed to create a window.\n");
DestroyWindow(hwEdit);
UnregisterClassA((LPCSTR)MAKEINTATOM(atom), hinst);
}
static void test_margins(void)
{
DWORD old_margins, new_margins;
@ -3393,6 +3458,7 @@ START_TEST(edit)
test_edit_control_6();
test_edit_control_limittext();
test_edit_control_scroll();
test_initialization();
test_margins();
test_margins_font_change();
test_text_position();