From: Olivier Matz Date: Thu, 6 Jun 2019 07:15:18 +0000 (+0200) Subject: ipv6: use READ_ONCE() for inet->hdrincl as in ipv4 X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=59e3e4b52663a9d97efbce7307f62e4bc5c9ce91;p=linux.git ipv6: use READ_ONCE() for inet->hdrincl as in ipv4 As it was done in commit 8f659a03a0ba ("net: ipv4: fix for a race condition in raw_sendmsg") and commit 20b50d79974e ("net: ipv4: emulate READ_ONCE() on ->hdrincl bit-field in raw_sendmsg()") for ipv4, copy the value of inet->hdrincl in a local variable, to avoid introducing a race condition in the next commit. Signed-off-by: Olivier Matz Signed-off-by: David S. Miller --- diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 96a3559f2a094..af2f9a833c4e3 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -783,6 +783,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) struct flowi6 fl6; struct ipcm6_cookie ipc6; int addr_len = msg->msg_namelen; + int hdrincl; u16 proto; int err; @@ -796,6 +797,13 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) if (msg->msg_flags & MSG_OOB) return -EOPNOTSUPP; + /* hdrincl should be READ_ONCE(inet->hdrincl) + * but READ_ONCE() doesn't work with bit fields. + * Doing this indirectly yields the same result. + */ + hdrincl = inet->hdrincl; + hdrincl = READ_ONCE(hdrincl); + /* * Get and verify the address. */ @@ -908,7 +916,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) fl6.flowi6_oif = np->ucast_oif; security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); - if (inet->hdrincl) + if (hdrincl) fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; if (ipc6.tclass < 0) @@ -931,7 +939,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) goto do_confirm; back_from_confirm: - if (inet->hdrincl) + if (hdrincl) err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags, &ipc6.sockc); else {