Re: [PATCH 1/2] Revert "UBIFS: Fix potential integer overflow in allocation"

From: Richard Weinberger
Date: Mon Jul 02 2018 - 17:42:10 EST

Am Montag, 2. Juli 2018, 20:27:00 CEST schrieb Kees Cook:
> > Let's queue another patch for the next merge window which converts
> > kmalloc() -> kmalloc_array().
> I'd prefer to leave it as-is for 4.18 because it would be the only
> unconverted kmalloc()-with-multiplication in the entire tree. We did
> treewide conversions and a revert would be undoing that here. (The
> scripts that check for this case would run "clean" for 4.18.)
> So, this gets back to the question of the int vs u32: if you just
> didn't revert this patch, then the kmalloc_array() would stand too.
> Easy! :)

I can queue the kmalloc_array() conversion on top of the revert.
But TBH, using kmalloc_array() here is just ridiculous, we allocate
dn->size times 2 where dn->size is at most 4k.