1 files changed, 12 insertions, 5 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 33b70bfd1122..5e570aa9e43b 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -513,11 +513,18 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
         int err;
         struct ip_options_data opt_copy;
         struct raw_frag_vec rfv;
+        int hdrincl;
 
         err = -EMSGSIZE;
         if (len > 0xFFFF)
                 goto out;
 
+        /* 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);
         /*
          *      Check the flags.
          */
@@ -593,7 +600,7 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
                 /* Linux does not mangle headers on raw sockets,
                  * so that IP options + IP_HDRINCL is non-sense.
                  */
-                if (inet->hdrincl)
+                if (hdrincl)
                         goto done;
                 if (ipc.opt->opt.srr) {
                         if (!daddr)
@@ -615,12 +622,12 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
         flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
                            RT_SCOPE_UNIVERSE,
-                           inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
+                           hdrincl ? IPPROTO_RAW : sk->sk_protocol,
                            inet_sk_flowi_flags(sk) |
-                            (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
+                            (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
                            daddr, saddr, 0, 0, sk->sk_uid);
 
-        if (!inet->hdrincl) {
+        if (!hdrincl) {
                 rfv.msg = msg;
                 rfv.hlen = 0;
 
@@ -645,7 +652,7 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
                 goto do_confirm;
 back_from_confirm:
 
-        if (inet->hdrincl)
+        if (hdrincl)
                 err = raw_send_hdrinc(sk, &fl4, msg, len,
                                       &rt, msg->msg_flags, &ipc.sockc);