Re: [Qemu-devel] [PATCH for-2.9 5/6] disas/cris: Avoid unintended sign extension

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Fri, Mar 03, 2017 at 03:50:32PM +0000, Peter Maydell wrote:
> In the cris disassembler we were using 'unsigned long' to calculate
> addresses which are supposed to be 32 bits.  This meant that we might
> accidentally sign extend or calculate a value that was outside the 32
> bit range of the guest CPU.  Use 'uint32_t' instead so we give the
> right answers on 64-bit hosts.
> 
> (Spotted by Coverity, CID 1005402, 1005403.)

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>


> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  disas/cris.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/disas/cris.c b/disas/cris.c
> index 8a1daf9..30217f1 100644
> --- a/disas/cris.c
> +++ b/disas/cris.c
> @@ -2009,7 +2009,7 @@ print_with_operands (const struct cris_opcode *opcodep,
>        case 'n':
>  	{
>  	  /* Like N but pc-relative to the start of the insn.  */
> -	  unsigned long number
> +	  uint32_t number
>  	    = (buffer[2] + buffer[3] * 256 + buffer[4] * 65536
>  	       + buffer[5] * 0x1000000 + addr);
>  
> @@ -2201,7 +2201,7 @@ print_with_operands (const struct cris_opcode *opcodep,
>  		      {
>  			/* It's [pc+].  This cannot possibly be anything
>  			   but an address.  */
> -			unsigned long number
> +			uint32_t number
>  			  = prefix_buffer[2] + prefix_buffer[3] * 256
>  			  + prefix_buffer[4] * 65536
>  			  + prefix_buffer[5] * 0x1000000;
> -- 
> 2.7.4
>