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| author | Eric Dumazet <edumazet@google.com> | 2017-04-08 08:07:33 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-09 18:27:28 -0700 |
| commit | 17c3060b1701fc69daedb4c90be6325d3d9fca8e (patch) | |
| tree | c150ad0125b753402cc71a88c863b5597f4c6b56 /kernel/bpf/core.c | |
| parent | df59577d8c6fecc53e0ea8e98519ee83b4ca5b04 (diff) | |
| download | op-kernel-dev-17c3060b1701fc69daedb4c90be6325d3d9fca8e.zip op-kernel-dev-17c3060b1701fc69daedb4c90be6325d3d9fca8e.tar.gz | |
tcp: clear saved_syn in tcp_disconnect()
In the (very unlikely) case a passive socket becomes a listener,
we do not want to duplicate its saved SYN headers.
This would lead to double frees, use after free, and please hackers and
various fuzzers
Tested:
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, IPPROTO_TCP, TCP_SAVE_SYN, [1], 4) = 0
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 5) = 0
+0 < S 0:0(0) win 32972 <mss 1460,nop,wscale 7>
+0 > S. 0:0(0) ack 1 <...>
+.1 < . 1:1(0) ack 1 win 257
+0 accept(3, ..., ...) = 4
+0 connect(4, AF_UNSPEC, ...) = 0
+0 close(3) = 0
+0 bind(4, ..., ...) = 0
+0 listen(4, 5) = 0
+0 < S 0:0(0) win 32972 <mss 1460,nop,wscale 7>
+0 > S. 0:0(0) ack 1 <...>
+.1 < . 1:1(0) ack 1 win 257
Fixes: cd8ae85299d5 ("tcp: provide SYN headers for passive connections")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/core.c')
0 files changed, 0 insertions, 0 deletions
