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| author |   Andi Kleen <ak@linux.intel.com> | 2013-09-30 13:29:11 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-10-02 16:32:43 -0400 |
| commit | 5843ef421311c34f06d5ab82bced5aebfe185b2c (patch) | |
| tree | 6c0900e7c8557e22ea382554cb3bd7c88e5be9d6 /net/ipv4/tcp_output.c | |
| parent | igb: Avoid uninitialized advertised variable in eee_set_cur (diff) | |
| download | linux-dev-5843ef421311c34f06d5ab82bced5aebfe185b2c.tar.xz linux-dev-5843ef421311c34f06d5ab82bced5aebfe185b2c.zip | |
tcp: Always set options to 0 before calling tcp_established_options
tcp_established_options assumes opts->options is 0 before calling,
as it read modify writes it.
For the tcp_current_mss() case the opts structure is not zeroed,
so this can be done with uninitialized values.
This is ok, because ->options is not read in this path.
But it's still better to avoid the operation on the uninitialized
field. This shuts up a static code analyzer, and presumably
may help the optimizer.
Cc: netdev@vger.kernel.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | net/ipv4/tcp_output.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index e6bb8256e59f..c6f01f2cdb32 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -637,6 +637,8 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb unsigned int size = 0; unsigned int eff_sacks; + opts->options = 0; + #ifdef CONFIG_TCP_MD5SIG *md5 = tp->af_specific->md5_lookup(sk, sk); if (unlikely(*md5)) { |