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devlink: Protect rate list with lock while switching modes

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Devlink eswitch set command doesn't hold devlink->lock, which makes
possible race condition between rate list traversing and others devlink
rate KAPI calls, like devlink_rate_nodes_destroy().
Hold devlink lock while traversing the list.

Fixes: a8ecb93ef0 ("devlink: Introduce rate nodes")
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmytro Linkin 2021-06-23 16:43:15 +03:00 • committed by David S. Miller
parent ff99324ded
commit a3e5e5797f
1 changed files with 4 additions and 0 deletions
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4
net/core/devlink.c
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@ -2710,11 +2710,15 @@ static int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
{ {
struct devlink_rate *devlink_rate; struct devlink_rate *devlink_rate;
/* Take the lock to sync with devlink_rate_nodes_destroy() */
mutex_lock(&devlink->lock);
list_for_each_entry(devlink_rate, &devlink->rate_list, list) list_for_each_entry(devlink_rate, &devlink->rate_list, list)
if (devlink_rate_is_node(devlink_rate)) { if (devlink_rate_is_node(devlink_rate)) {
mutex_unlock(&devlink->lock);
NL_SET_ERR_MSG_MOD(extack, "Rate node(s) exists."); NL_SET_ERR_MSG_MOD(extack, "Rate node(s) exists.");
return -EBUSY; return -EBUSY;
} }
mutex_unlock(&devlink->lock);
return 0; return 0;
} }