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[Qemu-devel] RE: [PATCH] hw/ivshmem.c don't check for negative values on
From: |
Hao, Xudong |
Subject: |
[Qemu-devel] RE: [PATCH] hw/ivshmem.c don't check for negative values on unsigned data types |
Date: |
Tue, 31 Aug 2010 14:01:37 +0800 |
address@hidden wrote:
> From: Jes Sorensen <address@hidden>
>
> There is no need to check for dest < 0 or vector >= 0 as both are
> uint16_t.
>
> This should fix problems with broken build with aggressive compiler
> flags. Reported by Xudong Hao <address@hidden>
>
> Signed-off-by: Jes Sorensen <address@hidden>
> ---
> hw/ivshmem.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/hw/ivshmem.c b/hw/ivshmem.c
> index bbb5cba..afebbc3 100644
> --- a/hw/ivshmem.c
> +++ b/hw/ivshmem.c
> @@ -199,13 +199,13 @@ static void ivshmem_io_writel(void *opaque,
> target_phys_addr_t addr,
>
> case DOORBELL:
> /* check that dest VM ID is reasonable */
> - if ((dest < 0) || (dest > s->max_peer)) {
> + if (dest > s->max_peer) {
> IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n",
> dest); break;
> }
>
> /* check doorbell range */
> - if ((vector >= 0) && (vector <
> s->peers[dest].nb_eventfds)) { + if (vector <
> s->peers[dest].nb_eventfds) {
>
> IVSHMEM_DPRINTF("Writing %" PRId64 " to VM %d on
> vector %d\n", write_one, dest, vector); if
> (write(s->peers[dest].eventfds[vector],
This patch works for me.
Thanks,
Xudong