diff options
| author | Sean Hefty <sean.hefty@intel.com> | 2011-02-23 08:17:40 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-23 13:16:43 -0700 |
| commit | b8f71b5843d1c61dab407ca70e600baaa4a30210 (patch) | |
| tree | 2d16f527ca3d11d959ab3e777d7d290bb633e83e /arch | |
| parent | df6f45842854d176147739fe1a8536ac6ce4acf1 (diff) | |
IB/cm: Bump reference count on cm_id before invoking callback
commit 29963437a48475036353b95ab142bf199adb909e upstream.
When processing a SIDR REQ, the ib_cm allocates a new cm_id. The
refcount of the cm_id is initialized to 1. However, cm_process_work
will decrement the refcount after invoking all callbacks. The result
is that the cm_id will end up with refcount set to 0 by the end of the
sidr req handler.
If a user tries to destroy the cm_id, the destruction will proceed,
under the incorrect assumption that no other threads are referencing
the cm_id. This can lead to a crash when the cm callback thread tries
to access the cm_id.
This problem was noticed as part of a larger investigation with kernel
crashes in the rdma_cm when running on a real time OS.
Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions