@@ -693,6 +693,8 @@ static ssize_t bonding_store_downdelay(struct device *d,
int new_value, ret = count;
struct bonding *bond = to_bond(d);
+ if (!rtnl_trylock())
+ return restart_syscall();
if (!(bond->params.miimon)) {
pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
bond->dev->name);
@@ -726,6 +728,7 @@ static ssize_t bonding_store_downdelay(struct device *d,
}
out:
+ rtnl_unlock();
return ret;
}
static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
@@ -748,6 +751,8 @@ static ssize_t bonding_store_updelay(struct device *d,
int new_value, ret = count;
struct bonding *bond = to_bond(d);
+ if (!rtnl_trylock())
+ return restart_syscall();
if (!(bond->params.miimon)) {
pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
bond->dev->name);
@@ -781,6 +786,7 @@ static ssize_t bonding_store_updelay(struct device *d,
}
out:
+ rtnl_unlock();
return ret;
}
static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
This is a note to let you know that I have just added a patch titled bonding: fix two race conditions in bond_store_updelay/downdelay to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 6e48aadb7ea6136b45e26c87bd487a5abd83ef8b Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov <nikolay@redhat.com> Date: Wed, 13 Nov 2013 17:07:46 +0100 Subject: bonding: fix two race conditions in bond_store_updelay/downdelay commit b869ccfab1e324507fa3596e3e1308444fb68227 upstream. This patch fixes two race conditions between bond_store_updelay/downdelay and bond_store_miimon which could lead to division by zero as miimon can be set to 0 while either updelay/downdelay are being set and thus miss the zero check in the beginning, the zero div happens because updelay/downdelay are stored as new_value / bond->params.miimon. Use rtnl to synchronize with miimon setting. CC: Jay Vosburgh <fubar@us.ibm.com> CC: Andy Gospodarek <andy@greyhouse.net> CC: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Acked-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/net/bonding/bond_sysfs.c | 6 ++++++ 1 file changed, 6 insertions(+) -- 1.8.3.2