RFR: JDK-8344907 : NullPointerException in Win32ShellFolder2.getSystemIcon when "icon" is null [v4]

[Alexander Zuev]

On Wed, 8 Jan 2025 19:14:56 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> Win32ShellFolder2.getSystemIcon() can result in NPE if icon is null. Sanity null checks have been added.
>> 
>> 
>> long hIcon = getSystemIcon(iconType.getIconID()); //Can return null
>> Image icon = makeIcon(hIcon); // returns null if the condition (hIcon != 0L && hIcon != -1L) is false
>> if (LARGE_ICON_SIZE != icon.getWidth(null)) { // NullPointerException -- icon is null
>> 
>> 
>> Occurs when Windows is unable to provide a system icon and the code assumes an icon will **always** be returned, but the Windows API makes no such guarantee.
>> 
>> getSystemIcon calls LoadIcon (User32.dll). This can return null.
>> https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-loadicona
>
> Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   minor

Looks good.

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Marked as reviewed by kizune (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/22776#pullrequestreview-2540639828