From: Jakub Kicinski kuba@kernel.org
[ Upstream commit 214964a13ab56a9757d146b79b468a7ca190fbfb ]
Take the instance lock around devlink_nl_fill() when dumping, doit takes it already.
We are only dumping basic info so in the worst case we were risking data races around the reload statistics. Until the big devlink mutex was removed all relevant code was protected by it, so the missing instance lock was not exposed.
Fixes: d3efc2a6a6d8 ("net: devlink: remove devlink_mutex") Reviewed-by: Jiri Pirko jiri@nvidia.com Reviewed-by: Jacob Keller jacob.e.keller@intel.com Link: https://lore.kernel.org/r/20221216044122.1863550-1-kuba@kernel.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/devlink.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/net/core/devlink.c b/net/core/devlink.c index e8f1af4231db..2aa77d4b80d0 100644 --- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -1505,10 +1505,13 @@ static int devlink_nl_cmd_get_dumpit(struct sk_buff *msg, continue; }
+ devl_lock(devlink); err = devlink_nl_fill(msg, devlink, DEVLINK_CMD_NEW, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI); + devl_unlock(devlink); devlink_put(devlink); + if (err) goto out; idx++;