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tcp: Document use of undefined variable.

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Both tcp_timewait_state_process and tcp_check_req use the same basic
construct of

	struct tcp_options received tmp_opt;
	tmp_opt.saw_tstamp = 0;

then call

	tcp_parse_options

However if they are fed a frame containing a TCP_SACK then tbe code
behaviour is undefined because opt_rx->sack_ok is undefined data.

This ought to be documented if it is intentional.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alan Cox 2012-09-19 15:46:06 +01:00 committed by David S. Miller
parent bb68b64724
commit 4308fc58dc
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/tcp_minisocks.c
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@ -85,6 +85,8 @@ static bool tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
* spinlock it. I do not want! Well, probability of misbehaviour
* is ridiculously low and, seems, we could use some mb() tricks
* to avoid misread sequence numbers, states etc. --ANK
*
* We don't need to initialize tmp_out.sack_ok as we don't use the results
*/
enum tcp_tw_status
tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb,
@ -522,6 +524,8 @@ EXPORT_SYMBOL(tcp_create_openreq_child);
*
* XXX (TFO) - The current impl contains a special check for ack
* validation and inside tcp_v4_reqsk_send_ack(). Can we do better?
*
* We don't need to initialize tmp_opt.sack_ok as we don't use the results
*/
struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,