From: Kuniyuki Iwashima kuniyu@amazon.com
stable inclusion from stable-v4.19.257 commit c3d0b6b3c808ff7d5439fbe6a41108bbb000ab26 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5UQH4 CVE: NA
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[ 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@amazon.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/dev.c b/net/core/dev.c index c7a21172c482..b4b84d55bdfa 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -6327,7 +6327,7 @@ 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);