tcp: fix crashes in do_tcp_sendpages()

Recent network changes allowed high order pages being used
for skb fragments.

This uncovered a bug in do_tcp_sendpages() which was assuming its caller
provided an array of order-0 page pointers.

We only have to deal with a single page in this function, and its order
is irrelevant.

Reported-by: Willy Tarreau <w@1wt.eu>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 083092e..e457c7a 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -830,8 +830,8 @@ static int tcp_send_mss(struct sock *sk, int *size_goal, int flags)
        return mss_now;
 }
 
-static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset,
-                        size_t psize, int flags)
+static ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset,
+                               size_t size, int flags)
 {
        struct tcp_sock *tp = tcp_sk(sk);
        int mss_now, size_goal;
@@ -858,12 +858,9 @@ static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffse
        if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
                goto out_err;
 
-       while (psize > 0) {
+       while (size > 0) {
                struct sk_buff *skb = tcp_write_queue_tail(sk);
-               struct page *page = pages[poffset / PAGE_SIZE];
                int copy, i;
-               int offset = poffset % PAGE_SIZE;
-               int size = min_t(size_t, psize, PAGE_SIZE - offset);
                bool can_coalesce;
 
                if (!tcp_send_head(sk) || (copy = size_goal - skb->len) <= 0) {
@@ -912,8 +909,8 @@ new_segment:
                        TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH;
 
                copied += copy;
-               poffset += copy;
-               if (!(psize -= copy))
+               offset += copy;
+               if (!(size -= copy))
                        goto out;
 
                if (skb->len < size_goal || (flags & MSG_OOB))
@@ -960,7 +957,7 @@ int tcp_sendpage(struct sock *sk, struct page *page, int offset,
                                        flags);
 
        lock_sock(sk);
-       res = do_tcp_sendpages(sk, &page, offset, size, flags);
+       res = do_tcp_sendpages(sk, page, offset, size, flags);
        release_sock(sk);
        return res;
 }