diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2024-06-05 17:51:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-03 09:54:30 +0300 |
| commit | ff5bbbdee08287d75d72e65b72a2b76d9637892a (patch) | |
| tree | 6c26168219795385871163694f3cad0a52f9c5a2 /drivers/infiniband/core/iwcm.c | |
| parent | aa9ccec6e215b54805d86c21373c0df36cd63abd (diff) | |
| download | linux-ff5bbbdee08287d75d72e65b72a2b76d9637892a.tar.xz | |
RDMA/iwcm: Fix a use-after-free related to destroying CM IDs
commit aee2424246f9f1dadc33faa78990c1e2eb7826e4 upstream.
iw_conn_req_handler() associates a new struct rdma_id_private (conn_id) with
an existing struct iw_cm_id (cm_id) as follows:
conn_id->cm_id.iw = cm_id;
cm_id->context = conn_id;
cm_id->cm_handler = cma_iw_handler;
rdma_destroy_id() frees both the cm_id and the struct rdma_id_private. Make
sure that cm_work_handler() does not trigger a use-after-free by only
freeing of the struct rdma_id_private after all pending work has finished.
Cc: stable@vger.kernel.org
Fixes: 59c68ac31e15 ("iw_cm: free cm_id resources on the last deref")
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Tested-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240605145117.397751-6-bvanassche@acm.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/infiniband/core/iwcm.c')
| -rw-r--r-- | drivers/infiniband/core/iwcm.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/infiniband/core/iwcm.c b/drivers/infiniband/core/iwcm.c index 2b47073c61a6..2d09d1be38f1 100644 --- a/drivers/infiniband/core/iwcm.c +++ b/drivers/infiniband/core/iwcm.c @@ -369,8 +369,10 @@ EXPORT_SYMBOL(iw_cm_disconnect); * * Clean up all resources associated with the connection and release * the initial reference taken by iw_create_cm_id. + * + * Returns true if and only if the last cm_id_priv reference has been dropped. */ -static void destroy_cm_id(struct iw_cm_id *cm_id) +static bool destroy_cm_id(struct iw_cm_id *cm_id) { struct iwcm_id_private *cm_id_priv; struct ib_qp *qp; @@ -440,7 +442,7 @@ static void destroy_cm_id(struct iw_cm_id *cm_id) iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM); } - (void)iwcm_deref_id(cm_id_priv); + return iwcm_deref_id(cm_id_priv); } /* @@ -451,7 +453,8 @@ static void destroy_cm_id(struct iw_cm_id *cm_id) */ void iw_destroy_cm_id(struct iw_cm_id *cm_id) { - destroy_cm_id(cm_id); + if (!destroy_cm_id(cm_id)) + flush_workqueue(iwcm_wq); } EXPORT_SYMBOL(iw_destroy_cm_id); @@ -1035,7 +1038,7 @@ static void cm_work_handler(struct work_struct *_work) if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) { ret = process_event(cm_id_priv, &levent); if (ret) - destroy_cm_id(&cm_id_priv->id); + WARN_ON_ONCE(destroy_cm_id(&cm_id_priv->id)); } else pr_debug("dropping event %d\n", levent.event); if (iwcm_deref_id(cm_id_priv)) |