This is a note to let you know that I've just added the patch titled net: Fix a data-race around netdev_budget. to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-fix-a-data-race-around-netdev_budget.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit c319552831a759de6f575a12d96edac3d1355693 Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx> Date: Tue Aug 23 10:46:53 2022 -0700 net: Fix a data-race around netdev_budget. [ Upstream commit 2e0c42374ee32e72948559d2ae2f7ba3dc6b977c ] While reading netdev_budget, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 51b0bdedb8e7 ("[NET]: Separate two usages of netdev_max_backlog.") Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/core/dev.c b/net/core/dev.c index 99b0025864984..7c19e672dde84 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6394,7 +6394,7 @@ static __latent_entropy void net_rx_action(struct softirq_action *h) struct softnet_data *sd = this_cpu_ptr(&softnet_data); unsigned long time_limit = jiffies + usecs_to_jiffies(netdev_budget_usecs); - int budget = netdev_budget; + int budget = READ_ONCE(netdev_budget); LIST_HEAD(list); LIST_HEAD(repoll);