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authorEric Dumazet <edumazet@google.com>2023-09-12 12:17:30 +0300
committerPaolo Abeni <pabeni@redhat.com>2023-09-14 17:16:36 +0300
commit882af43a0fc37e26d85fb0df0c9edd3bed928de4 (patch)
tree285d545b88e7edfaa8c03073cad7e8f4ae1cf572 /net/ipv6/udp.c
parent729549aa350c56a777bb342941ed4d69b6585769 (diff)
downloadlinux-882af43a0fc37e26d85fb0df0c9edd3bed928de4.tar.xz
udplite: fix various data-races
udp->pcflag, udp->pcslen and udp->pcrlen reads/writes are racy. Move udp->pcflag to udp->udp_flags for atomicity, and add READ_ONCE()/WRITE_ONCE() annotations for pcslen and pcrlen. Fixes: ba4e58eca8aa ("[NET]: Supporting UDP-Lite (RFC 3828) in Linux") Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 0e79d189613b..f60ba4295435 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -727,16 +727,17 @@ static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
/*
* UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
*/
- if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
+ if (udp_test_bit(UDPLITE_RECV_CC, sk) && UDP_SKB_CB(skb)->partial_cov) {
+ u16 pcrlen = READ_ONCE(up->pcrlen);
- if (up->pcrlen == 0) { /* full coverage was set */
+ if (pcrlen == 0) { /* full coverage was set */
net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n",
UDP_SKB_CB(skb)->cscov, skb->len);
goto drop;
}
- if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
+ if (UDP_SKB_CB(skb)->cscov < pcrlen) {
net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n",
- UDP_SKB_CB(skb)->cscov, up->pcrlen);
+ UDP_SKB_CB(skb)->cscov, pcrlen);
goto drop;
}
}