Re: [PATCH] target/s390x: Fix the accumulation of ccm in op_icm

[Richard Henderson]

On 4/1/22 12:36, Richard Henderson wrote:
> Coverity rightly reports that 0xff << pos can overflow.
> This would affect the ICMH instruction.
>
> Fixes: Coverity CID 1487161
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   target/s390x/tcg/translate.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
> index 5acfc0ff9b..ea7baf0832 100644
> --- a/target/s390x/tcg/translate.c
> +++ b/target/s390x/tcg/translate.c
> @@ -2622,7 +2622,7 @@ static DisasJumpType op_icm(DisasContext *s, DisasOps *o)
>                   tcg_gen_qemu_ld8u(tmp, o->in2, get_mem_index(s));
>                   tcg_gen_addi_i64(o->in2, o->in2, 1);
>                   tcg_gen_deposit_i64(o->out, o->out, tmp, pos, 8);
> -                ccm |= 0xff << pos;
> +                ccm |= 0xffull << pos;
>               }
>               m3 = (m3 << 1) & 0xf;
>               pos -= 8;

Queuing to tcg-next.


r~