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Re: [Qemu-arm] [Qemu-devel] [PATCH for-4.1] hw/ssi/xilinx_spips: Avoid v
From: |
Francisco Iglesias |
Subject: |
Re: [Qemu-arm] [Qemu-devel] [PATCH for-4.1] hw/ssi/xilinx_spips: Avoid variable length array |
Date: |
Fri, 29 Mar 2019 00:14:05 +0100 |
User-agent: |
NeoMutt/20170113 (1.7.2) |
On [2019 Mar 28] Thu 15:26:35, Peter Maydell wrote:
> In the stripe8() function we use a variable length array; however
> we know that the maximum length required is MAX_NUM_BUSSES. Use
> a fixed-length array and an assert instead.
>
> Signed-off-by: Peter Maydell <address@hidden>
Reviewed-by: Francisco Iglesias <address@hidden>
> ---
> hw/ssi/xilinx_spips.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c
> index 16f88f74029..c615058cc1b 100644
> --- a/hw/ssi/xilinx_spips.c
> +++ b/hw/ssi/xilinx_spips.c
> @@ -429,12 +429,14 @@ static void xlnx_zynqmp_qspips_reset(DeviceState *d)
>
> static inline void stripe8(uint8_t *x, int num, bool dir)
> {
> - uint8_t r[num];
> - memset(r, 0, sizeof(uint8_t) * num);
> + uint8_t r[MAX_NUM_BUSSES];
> int idx[2] = {0, 0};
> int bit[2] = {0, 7};
> int d = dir;
>
> + assert(num <= MAX_NUM_BUSSES);
> + memset(r, 0, sizeof(uint8_t) * num);
> +
> for (idx[0] = 0; idx[0] < num; ++idx[0]) {
> for (bit[0] = 7; bit[0] >= 0; bit[0]--) {
> r[idx[!d]] |= x[idx[d]] & 1 << bit[d] ? 1 << bit[!d] : 0;
> --
> 2.20.1
>
>