diff options
| author | Tom Herbert <tom@herbertland.com> | 2016-08-23 11:55:31 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-08-23 16:23:12 -0700 |
| commit | 1616b38f201945f5fc88aa09b525e3625777aa7c (patch) | |
| tree | 0d5f890a7b0d21fa7c4d7580a70e0bfcae2c0738 /net/kcm/kcmsock.c | |
| parent | cff6a334e63420e95ec40dc7fcdc0b8258615760 (diff) | |
| download | linux-1616b38f201945f5fc88aa09b525e3625777aa7c.tar.bz2 | |
kcm: Fix locking issue
Lock the lower socket in kcm_unattach. Release during call to strp_done
since that function cancels the RX timers and work queue with sync.
Also added some status information in psock reporting.
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/kcm/kcmsock.c')
| -rw-r--r-- | net/kcm/kcmsock.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c index eedbe404af35..eb731cacc325 100644 --- a/net/kcm/kcmsock.c +++ b/net/kcm/kcmsock.c @@ -1477,12 +1477,13 @@ out: return err; } -/* Lower socket lock held */ static void kcm_unattach(struct kcm_psock *psock) { struct sock *csk = psock->sk; struct kcm_mux *mux = psock->mux; + lock_sock(csk); + /* Stop getting callbacks from TCP socket. After this there should * be no way to reserve a kcm for this psock. */ @@ -1514,7 +1515,10 @@ static void kcm_unattach(struct kcm_psock *psock) write_unlock_bh(&csk->sk_callback_lock); + /* Call strp_done without sock lock */ + release_sock(csk); strp_done(&psock->strp); + lock_sock(csk); bpf_prog_put(psock->bpf_prog); @@ -1564,6 +1568,8 @@ no_reserved: fput(csk->sk_socket->file); kmem_cache_free(kcm_psockp, psock); } + + release_sock(csk); } static int kcm_unattach_ioctl(struct socket *sock, struct kcm_unattach *info) @@ -1749,11 +1755,8 @@ static void release_mux(struct kcm_mux *mux) /* Release psocks */ list_for_each_entry_safe(psock, tmp_psock, &mux->psocks, psock_list) { - if (!WARN_ON(psock->unattaching)) { - lock_sock(psock->strp.sk); + if (!WARN_ON(psock->unattaching)) kcm_unattach(psock); - release_sock(psock->strp.sk); - } } if (WARN_ON(mux->psocks_cnt)) |