Error when changing push 0 to push function

Question

Hi I am sort of new to ida pro even though I've used a lot but when I push a function where a 0 used to be it gives me sp-analysis failure

I've searched for a fix for a while to no avail help would be much appreciated.

Answer 1

Turn on bytes. You'll see you don't have enough space. You're going to have to figure out where to steal some. Wherever that is, via jump short, you need a couple more bytes.

Answer 2

The problem is that you are changing 2 bytes instruction push 0 into push offset which is 5 bytes instruction. So you overwrite subsequent instruction’s prefix and that’s why sp analysis fails (push offset Studio_done changed to db 0 and pop, so you have pop instead of push).