Messages in this thread Patch in this message | | | From | Bjorn Andersson <> | Subject | [PATCH 2/6] rpmsg: glink: Fix use after free in open_ack TIMEOUT case | Date | Wed, 18 Sep 2019 10:19:12 -0700 |
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From: Arun Kumar Neelakantam <aneela@codeaurora.org>
Extra channel reference put when remote sending OPEN_ACK after timeout causes use-after-free while handling next remote CLOSE command.
Remove extra reference put in timeout case to avoid use-after-free.
Fixes: b4f8e52b89f6 ("rpmsg: Introduce Qualcomm RPM glink driver") Cc: stable@vger.kernel.org Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> --- drivers/rpmsg/qcom_glink_native.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 9355ce26fd98..72ed671f5dcd 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -1103,13 +1103,12 @@ static int qcom_glink_create_remote(struct qcom_glink *glink, close_link: /* * Send a close request to "undo" our open-ack. The close-ack will - * release the last reference. + * release qcom_glink_send_open_req() reference and the last reference + * will be relesed after receiving remote_close or transport unregister + * by calling qcom_glink_native_remove(). */ qcom_glink_send_close_req(glink, channel); - /* Release qcom_glink_send_open_req() reference */ - kref_put(&channel->refcount, qcom_glink_channel_release); - return ret; } -- 2.18.0
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