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| author |   Michal Kubeček <mkubecek@suse.cz> | 2015-03-23 15:14:00 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-03-23 22:38:24 -0400 |
| commit | d0c294c53a771ae7e84506dfbd8c18c30f078735 (patch) | |
| tree | b62e37cf9a4ae8d7bce4410f5a21983ed2025b6d /net/core/rtnetlink.c | |
| parent | bnx2x: Fix statistics locking scheme (diff) | |
| download | linux-dev-d0c294c53a771ae7e84506dfbd8c18c30f078735.tar.xz linux-dev-d0c294c53a771ae7e84506dfbd8c18c30f078735.zip | |
tcp: prevent fetching dst twice in early demux code
On s390x, gcc 4.8 compiles this part of tcp_v6_early_demux()
struct dst_entry *dst = sk->sk_rx_dst;
if (dst)
dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
to code reading sk->sk_rx_dst twice, once for the test and once for
the argument of ip6_dst_check() (dst_check() is inline). This allows
ip6_dst_check() to be called with null first argument, causing a crash.
Protect sk->sk_rx_dst access by READ_ONCE() both in IPv4 and IPv6
TCP early demux code.
Fixes: 41063e9dd119 ("ipv4: Early TCP socket demux.")
Fixes: c7109986db3c ("ipv6: Early TCP socket demux")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/rtnetlink.c')
0 files changed, 0 insertions, 0 deletions