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| author | Doron Tsur <doront@mellanox.com> | 2015-10-11 15:58:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-11-09 12:50:26 -0800 |
| commit | 0a494af786ed92017825ad11a0351e869d1ff977 (patch) | |
| tree | 090150dadd84d7b5b578662b47bad1c975561da1 | |
| parent | a672d16d8c2adb6f007c28ff76e94bb2eb9fdfe4 (diff) | |
| download | lwn-0a494af786ed92017825ad11a0351e869d1ff977.tar.gz lwn-0a494af786ed92017825ad11a0351e869d1ff977.zip | |
IB/cm: Fix rb-tree duplicate free and use-after-free
commit 0ca81a2840f77855bbad1b9f172c545c4dc9e6a4 upstream.
ib_send_cm_sidr_rep could sometimes erase the node from the sidr
(depending on errors in the process). Since ib_send_cm_sidr_rep is
called both from cm_sidr_req_handler and cm_destroy_id, cm_id_priv
could be either erased from the rb_tree twice or not erased at all.
Fixing that by making sure it's erased only once before freeing
cm_id_priv.
Fixes: a977049dacde ('[PATCH] IB: Add the kernel CM implementation')
Signed-off-by: Doron Tsur <doront@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/infiniband/core/cm.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index c3239170d8b7..5311cac12132 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -860,6 +860,11 @@ retest: case IB_CM_SIDR_REQ_RCVD: spin_unlock_irq(&cm_id_priv->lock); cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); + spin_lock_irq(&cm.lock); + if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) + rb_erase(&cm_id_priv->sidr_id_node, + &cm.remote_sidr_table); + spin_unlock_irq(&cm.lock); break; case IB_CM_REQ_SENT: ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); @@ -3099,7 +3104,10 @@ int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, spin_unlock_irqrestore(&cm_id_priv->lock, flags); spin_lock_irqsave(&cm.lock, flags); - rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { + rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); + } spin_unlock_irqrestore(&cm.lock, flags); return 0; |