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author | Xin Long <lucien.xin@gmail.com> | 2017-07-26 09:19:09 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-11 19:08:54 +0300 |
commit | c3278ed37d3e34178e578914dd45b2a0df79b5b8 (patch) | |
tree | 8f7fe8651b8c930b92256b62ee2c2d24c1348a68 /arch | |
parent | 91c5aa7ea0737d374601687fec02ddd25aefd6e8 (diff) | |
download | linux-c3278ed37d3e34178e578914dd45b2a0df79b5b8.tar.xz |
dccp: fix a memleak that dccp_ipv6 doesn't put reqsk properly
[ Upstream commit 0c2232b0a71db0ac1d22f751aa1ac0cadb950fd2 ]
In dccp_v6_conn_request, after reqsk gets alloced and hashed into
ehash table, reqsk's refcnt is set 3. one is for req->rsk_timer,
one is for hlist, and the other one is for current using.
The problem is when dccp_v6_conn_request returns and finishes using
reqsk, it doesn't put reqsk. This will cause reqsk refcnt leaks and
reqsk obj never gets freed.
Jianlin found this issue when running dccp_memleak.c in a loop, the
system memory would run out.
dccp_memleak.c:
int s1 = socket(PF_INET6, 6, IPPROTO_IP);
bind(s1, &sa1, 0x20);
listen(s1, 0x9);
int s2 = socket(PF_INET6, 6, IPPROTO_IP);
connect(s2, &sa1, 0x20);
close(s1);
close(s2);
This patch is to put the reqsk before dccp_v6_conn_request returns,
just as what tcp_conn_request does.
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions