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tcp: Return error instead of partial read for saved syn headers 

Currently the getsockopt() requesting the cached contents of the syn
packet headers will fail silently if the caller uses a buffer that is
too small to contain the requested data.  Rather than fail silently and
discard the headers, getsockopt() should return an error and report the
required size to hold the data.

Signed-off-by: Eric B Munson <emunson@akamai.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: James Morris <jmorris@namei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric B Munson 2015-05-18 14:35:58 -04:00 committed by David S. Miller
parent c9a70d4346
commit aea0929e51
1 changed files with 9 additions and 1 deletions
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10
net/ipv4/tcp.c
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@ -2845,7 +2845,15 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
lock_sock(sk);
if (tp->saved_syn) {
len = min_t(unsigned int, tp->saved_syn[0], len);
if (len < tp->saved_syn[0]) {
if (put_user(tp->saved_syn[0], optlen)) {
release_sock(sk);
return -EFAULT;
}
release_sock(sk);
return -EINVAL;
}
len = tp->saved_syn[0];
if (put_user(len, optlen)) {
release_sock(sk);
return -EFAULT;