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From f853012bc0142ab6056f3d9ef4abf621b1e8a756 Mon Sep 17 00:00:00 2001
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From: Gopal Tiwari <gtiwari@redhat.com>
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Date: Tue, 24 May 2022 16:45:56 +0530
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Subject: [PATCH BlueZ] gatt: Fix double free and freed memory dereference
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commit 3627eddea13042ffc0848ae37356f30335ce2e4b
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Author: Ildar Kamaletdinov <i.kamaletdinov@omp.ru>
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Date: Fri Apr 1 15:16:47 2022 +0300
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gatt: Fix double free and freed memory dereference
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If device is no longer exists or not paired when notifications send it
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is possible to get double free and dereference of already freed memory.
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To avoid this we need to recheck the state of device after sending
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notification.
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Found by Linux Verification Center (linuxtesting.org) with the SVACE
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static analysis tool.
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---
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src/gatt-database.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/src/gatt-database.c b/src/gatt-database.c
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index d6c94058c..d32f616a9 100644
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--- a/src/gatt-database.c
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+++ b/src/gatt-database.c
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@@ -3877,6 +3877,10 @@ void btd_gatt_database_server_connected(struct btd_gatt_database *database,
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send_notification_to_device(state, state->pending);
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+ state = find_device_state(database, &bdaddr, bdaddr_type);
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+ if (!state || !state->pending)
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+ return;
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+
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free(state->pending->value);
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free(state->pending);
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state->pending = NULL;
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--
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2.26.2
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