Messages in this thread | | | From | Nick Desaulniers <> | Date | Mon, 13 Sep 2021 13:02:32 -0700 | Subject | Re: [PATCH 5.14 018/334] nbd: add the check to prevent overflow in __nbd_ioctl() |
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On Mon, Sep 13, 2021 at 12:57 PM Sedat Dilek <sedat.dilek@gmail.com> wrote: > > On Mon, Sep 13, 2021 at 9:53 PM 'Nick Desaulniers' via Clang Built > Linux <clang-built-linux@googlegroups.com> wrote: > > > > On Mon, Sep 13, 2021 at 11:39 AM Nick Desaulniers > > <ndesaulniers@google.com> wrote: > > > > > > There's an issue with my alternative approach > > > (https://gist.github.com/nickdesaulniers/2479818f4983bbf2d688cebbab435863) > > > with declaring the local variable z in div_64() since either operand > > > could be 64b, which result in an unwanted truncation if the dividend > > > is 32b (or less, and divisor is 64b). I think (what I realized this > > > weekend) is that we might be able to replace the `if` with > > > `__builtin_choose_expr`, then have that whole expression be the final > > > statement and thus the "return value" of the statement expression. > > > > Christ...that...works? Though, did Linus just merge my patches for gcc 5.1? > > > > "Merge branch 'gcc-min-version-5.1' (make gcc-5.1 the minimum version)"
Ha! I pulled+rebased and this code disappeared...I thought I had rebased on the wrong branch or committed work to master accidentally. Patch to stable-only inbound. -- Thanks, ~Nick Desaulniers
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