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rpmsg: glink: Fix use after free in open_ack TIMEOUT case 

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: b4f8e52b89 ("rpmsg: Introduce Qualcomm RPM glink driver")
Cc: stable@vger.kernel.org
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Arun Kumar Neelakantam 2019-10-04 15:26:58 -07:00 committed by Bjorn Andersson
parent b85f6b6014
commit ac74ea0186
1 changed files with 3 additions and 4 deletions
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7
drivers/rpmsg/qcom_glink_native.c
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@ -1103,13 +1103,12 @@ static int qcom_glink_create_remote(struct qcom_glink *glink,
close_link: close_link:
/* /*
* Send a close request to "undo" our open-ack. The close-ack will * 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); qcom_glink_send_close_req(glink, channel);
/* Release qcom_glink_send_open_req() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
return ret; return ret;
} }