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Date: Fri, 17 Mar 2023 13:51:17 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com> Cc: Kees Cook <keescook@...omium.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Jens Axboe <axboe@...nel.dk>, Nathan Chancellor <nathan@...nel.org>, "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>, clang-built-linux <llvm@...ts.linux.dev>, linux-hardening@...r.kernel.org Subject: Re: [GIT PULL] Block fixes for 6.3-rc3 On Fri, Mar 17, 2023 at 1:42 PM Miguel Ojeda <miguel.ojeda.sandonis@...il.com> wrote: > > It is comparing against just the `.code` in the `m5mols_default_ffmt` > table, i.e. the `MEDIA_BUS_FMT_VYUY8_2X8` (8199 = 0x2007) and > `MEDIA_BUS_FMT_JPEG_1X8` (16385 = 0x4001), see Yeah, I see what it's doing. But: > If the condition had `++type` instead, it would not be a problem, > because the loop stops before we go into the out of bounds access thus > no UB. Yeah, but clang really should have generated a proper third iteration, which calls that "out of bounds" case, and then returns, instead fo falling off the end. I do think that on the kernel side, the fix is to just change } while (type++ != SIZE_DEFAULT_FFMT); to } while (++type != SIZE_DEFAULT_FFMT); but I would *really* like clang to be fixed to not silently generate code that does insane things and would be basically impossible to debug if it ever triggers. We would have spent a *lot* of time wondering how the heck we Oopsed in m5mols_get_frame_desc(). Linus
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