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    Subject[PATCH 124/133] sysctl net: Keep tcp_syn_retries inside the boundary
    Date
    3.8.13.7 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Michal Tesar <mtesar@redhat.com>

    [ Upstream commit 651e92716aaae60fc41b9652f54cb6803896e0da ]

    Limit the min/max value passed to the
    /proc/sys/net/ipv4/tcp_syn_retries.

    Signed-off-by: Michal Tesar <mtesar@redhat.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    net/ipv4/sysctl_net_ipv4.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
    index d84400b..63632ea 100644
    --- a/net/ipv4/sysctl_net_ipv4.c
    +++ b/net/ipv4/sysctl_net_ipv4.c
    @@ -35,6 +35,8 @@ static int tcp_adv_win_scale_min = -31;
    static int tcp_adv_win_scale_max = 31;
    static int ip_ttl_min = 1;
    static int ip_ttl_max = 255;
    +static int tcp_syn_retries_min = 1;
    +static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
    static int ip_ping_group_range_min[] = { 0, 0 };
    static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };

    @@ -330,7 +332,9 @@ static struct ctl_table ipv4_table[] = {
    .data = &sysctl_tcp_syn_retries,
    .maxlen = sizeof(int),
    .mode = 0644,
    - .proc_handler = proc_dointvec
    + .proc_handler = proc_dointvec_minmax,
    + .extra1 = &tcp_syn_retries_min,
    + .extra2 = &tcp_syn_retries_max
    },
    {
    .procname = "tcp_synack_retries",
    --
    1.8.1.2


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