From: Kuniyuki Iwashima Date: Tue, 23 Aug 2022 17:46:47 +0000 (-0700) Subject: net: Fix data-races around netdev_tstamp_prequeue. X-Git-Tag: v5.19.6~91 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c49b023e4e2eaa6401fba9fbb87867942ee53276;p=thirdparty%2Fkernel%2Fstable.git net: Fix data-races around netdev_tstamp_prequeue. [ Upstream commit 61adf447e38664447526698872e21c04623afb8e ] While reading netdev_tstamp_prequeue, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 3b098e2d7c69 ("net: Consistent skb timestamping") Signed-off-by: Kuniyuki Iwashima Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- diff --git a/net/core/dev.c b/net/core/dev.c index e1496e626a532..34282b93c3f60 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4927,7 +4927,7 @@ static int netif_rx_internal(struct sk_buff *skb) { int ret; - net_timestamp_check(netdev_tstamp_prequeue, skb); + net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); trace_netif_rx(skb); @@ -5280,7 +5280,7 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, int ret = NET_RX_DROP; __be16 type; - net_timestamp_check(!netdev_tstamp_prequeue, skb); + net_timestamp_check(!READ_ONCE(netdev_tstamp_prequeue), skb); trace_netif_receive_skb(skb); @@ -5663,7 +5663,7 @@ static int netif_receive_skb_internal(struct sk_buff *skb) { int ret; - net_timestamp_check(netdev_tstamp_prequeue, skb); + net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); if (skb_defer_rx_timestamp(skb)) return NET_RX_SUCCESS; @@ -5693,7 +5693,7 @@ void netif_receive_skb_list_internal(struct list_head *head) INIT_LIST_HEAD(&sublist); list_for_each_entry_safe(skb, next, head, list) { - net_timestamp_check(netdev_tstamp_prequeue, skb); + net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); skb_list_del_init(skb); if (!skb_defer_rx_timestamp(skb)) list_add_tail(&skb->list, &sublist);