[PATCH v2 0/1] MR6650: comdlg32: Allocate extbuf on heap rather than stack.

[Charlotte Pabst (＠CharlottePabst)]

This fixes a stack overflow in Helicon Focus 8.2.0,
which was introduced by b5cbb556.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57293

I'm unsure if this is actually the proper way to approach this problem, since an application being so close to a stack overflow that an allocation of wchar_t[MAX_PATH] (=260*2 bytes) is making the difference between crashing and not crashing might be an issue in itself.

However, the crash was introduced by adding this allocation (or rather, changing the condition for it to happen) in previous commit, so for now I think the proper solution would be to move it to the heap instead.

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  v2: comdlg32: Allocate extbuf on heap rather than stack.

https://gitlab.winehq.org/wine/wine/-/merge_requests/6650