From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
If there is a pending notify multiple the code was not removing before
freeing the object causing the following crash:
Invalid read of size 8
at 0x4A3D10: notify_multiple (gatt-server.c:1703)
by 0x4D05F0: timeout_callback (timeout-glib.c:25)
by 0x4956900: ??? (in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x49560AE: g_main_context_dispatch
(in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x49AB307: ??? (in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x49557C2: g_main_loop_run
(in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x4D0A34: mainloop_run (mainloop-glib.c:66)
by 0x4D0F2B: mainloop_run_with_signal (mainloop-notify.c:188)
by 0x2B0CD1: main (main.c:1276)
Address 0x6ca35c8 is 136 bytes inside a block of size 144 free'd
at 0x48470E4: free (vg_replace_malloc.c:872)
by 0x415E73: gatt_server_cleanup (device.c:698)
by 0x415E73: attio_cleanup (device.c:715)
by 0x47745B: queue_foreach (queue.c:207)
by 0x490C54: disconnect_cb (att.c:701)
by 0x4CF4AF: watch_callback (io-glib.c:157)
by 0x49560AE: g_main_context_dispatch
(in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x49AB307: ??? (in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x49557C2: g_main_loop_run
(in /usr/lib64/libglib-2.0.so.0.7000.5)
by 0x4D0A34: mainloop_run (mainloop-glib.c:66)
by 0x4D0F2B: mainloop_run_with_signal (mainloop-notify.c:188)
by 0x2B0CD1: main (main.c:1276)
---
src/shared/gatt-server.c | 33 ++++++++++++++++++++++++++++-----
1 file changed, 28 insertions(+), 5 deletions(-)
diff --git a/src/shared/gatt-server.c b/src/shared/gatt-server.c
index 2adb4afbf..85cff30ec 100644
--- a/src/shared/gatt-server.c
+++ b/src/shared/gatt-server.c
@@ -121,11 +121,26 @@ struct bt_gatt_server {
struct nfy_mult_data *nfy_mult;
};
+static void notify_multiple_free(struct bt_gatt_server *server)
+{
+ if (!server->nfy_mult)
+ return;
+
+ if (server->nfy_mult->id)
+ timeout_remove(server->nfy_mult->id);
+
+ free(server->nfy_mult->pdu);
+ free(server->nfy_mult);
+ server->nfy_mult = NULL;
+}
+
static void bt_gatt_server_free(struct bt_gatt_server *server)
{
if (server->debug_destroy)
server->debug_destroy(server->debug_data);
+ notify_multiple_free(server);
+
bt_att_unregister(server->att, server->mtu_id);
bt_att_unregister(server->att, server->read_by_grp_type_id);
bt_att_unregister(server->att, server->read_by_type_id);
@@ -1695,17 +1710,26 @@ bool bt_gatt_server_set_debug(struct bt_gatt_server *server,
return true;
}
+static void notify_multiple_timeout_remove(struct bt_gatt_server *server)
+{
+ if (!server->nfy_mult->id)
+ return;
+
+ timeout_remove(server->nfy_mult->id);
+ server->nfy_mult->id = 0;
+}
+
static bool notify_multiple(void *user_data)
{
struct bt_gatt_server *server = user_data;
+ server->nfy_mult->id = 0;
+
bt_att_send(server->att, BT_ATT_OP_HANDLE_NFY_MULT,
server->nfy_mult->pdu, server->nfy_mult->offset, NULL,
NULL, NULL);
- free(server->nfy_mult->pdu);
- free(server->nfy_mult);
- server->nfy_mult = NULL;
+ notify_multiple_free(server);
return false;
}
@@ -1737,8 +1761,7 @@ bool bt_gatt_server_send_notification(struct bt_gatt_server *server,
/* flush buffered data if this request hits buffer size limit */
if (data && data->offset > 0 &&
data->len - data->offset < 4 + length) {
- if (server->nfy_mult->id)
- timeout_remove(server->nfy_mult->id);
+ notify_multiple_timeout_remove(server);
notify_multiple(server);
/* data has been freed by notify_multiple */
data = NULL;
--
2.35.1
