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| author | Bjorn Andersson <bjorn.andersson@linaro.org> | 2019-10-04 15:27:01 -0700 |
|---|---|---|
| committer | Bjorn Andersson <bjorn.andersson@linaro.org> | 2019-10-17 06:23:10 -0700 |
| commit | c3dadc19b7564c732598b30d637c6f275c3b77b6 (patch) | |
| tree | b6f01b54f11cea981a8a7123213b565b07f07643 /drivers/rpmsg/qcom_glink_native.c | |
| parent | f7e714988edaffe6ac578318e99501149b067ba0 (diff) | |
| download | lwn-c3dadc19b7564c732598b30d637c6f275c3b77b6.tar.gz lwn-c3dadc19b7564c732598b30d637c6f275c3b77b6.zip | |
rpmsg: glink: Don't send pending rx_done during remove
Attempting to transmit rx_done messages after the GLINK instance is
being torn down will cause use after free and memory leaks. So cancel
the intent_work and free up the pending intents.
With this there are no concurrent accessors of the channel left during
qcom_glink_native_remove() and there is therefor no need to hold the
spinlock during this operation - which would prohibit the use of
cancel_work_sync() in the release function. So remove this.
Fixes: 1d2ea36eead9 ("rpmsg: glink: Add rx done command")
Cc: stable@vger.kernel.org
Acked-by: Chris Lew <clew@codeaurora.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/rpmsg/qcom_glink_native.c')
| -rw-r--r-- | drivers/rpmsg/qcom_glink_native.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 89e02baea2d0..38599ff2b0a2 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -241,11 +241,23 @@ static void qcom_glink_channel_release(struct kref *ref) { struct glink_channel *channel = container_of(ref, struct glink_channel, refcount); + struct glink_core_rx_intent *intent; struct glink_core_rx_intent *tmp; unsigned long flags; int iid; + /* cancel pending rx_done work */ + cancel_work_sync(&channel->intent_work); + spin_lock_irqsave(&channel->intent_lock, flags); + /* Free all non-reuse intents pending rx_done work */ + list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { + if (!intent->reuse) { + kfree(intent->data); + kfree(intent); + } + } + idr_for_each_entry(&channel->liids, tmp, iid) { kfree(tmp->data); kfree(tmp); @@ -1625,7 +1637,6 @@ void qcom_glink_native_remove(struct qcom_glink *glink) struct glink_channel *channel; int cid; int ret; - unsigned long flags; disable_irq(glink->irq); cancel_work_sync(&glink->rx_work); @@ -1634,7 +1645,6 @@ void qcom_glink_native_remove(struct qcom_glink *glink) if (ret) dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); - spin_lock_irqsave(&glink->idr_lock, flags); /* Release any defunct local channels, waiting for close-ack */ idr_for_each_entry(&glink->lcids, channel, cid) kref_put(&channel->refcount, qcom_glink_channel_release); @@ -1645,7 +1655,6 @@ void qcom_glink_native_remove(struct qcom_glink *glink) idr_destroy(&glink->lcids); idr_destroy(&glink->rcids); - spin_unlock_irqrestore(&glink->idr_lock, flags); mbox_free_channel(glink->mbox_chan); } EXPORT_SYMBOL_GPL(qcom_glink_native_remove); |