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[ CCed Hans Schillstrom and Julian Anastasov ]
On Sun, Dec 12, 2010 at 07:42:29PM +0800, Tinggong Wang wrote:
> Signed-off-by: Tinggong Wang <wangtinggong@xxxxxxxxx>
> ---
> net/netfilter/ipvs/ip_vs_sync.c | 13 ++++++++-----
> 1 files changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
> index 7632a17..2b6b0cb 100644
> --- a/net/netfilter/ipvs/ip_vs_sync.c
> +++ b/net/netfilter/ipvs/ip_vs_sync.c
> @@ -315,11 +315,6 @@ static void ip_vs_process_message(const char *buffer,
> const size_t buflen)
> char *p;
> int i;
>
> - if (buflen < SYNC_MESG_HEADER_LEN) {
> - IP_VS_ERR_RL("sync message header too short\n");
> - return;
> - }
> -
> /* Convert size back to host byte order */
> m->size = ntohs(m->size);
>
> @@ -823,6 +818,14 @@ static int sync_thread_backup(void *data)
> break;
> }
>
> + /* throw invalid data before local_bh_disable,
> + * so performance won't be downgraded by it
> + */
> + if (len < SYNC_MESG_HEADER_LEN) {
> + IP_VS_ERR_RL("sync message header too short\n");
> + continue;
> + }
> +
> /* disable bottom half, because it accesses the data
> shared by softirq while getting/creating conns */
> local_bh_disable();
> --
> 1.7.2.3
>
Could you explain the motivation for this change?
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