Fwd: [PATCH 1/1] shared/gatt-client: Fix the "Find Information req" error

[Nagaraj D R <nagaraj.dr@xxxxxxxxxxx>]

ping

------- Original Message -------
Sender : Nagaraj D R<nagaraj.dr@xxxxxxxxxxx> Lead Engineer/SRI-Bangalore-System & Connectivity/Samsung Electronics
Date : May 13, 2015 17:05 (GMT+05:30)
Title : [PATCH 1/1] shared/gatt-client: Fix the "Find Information req" error

From: "nagaraj.dr" 

characteristic descriptor is searched b/w the
characteristic "value_handle + 1" and
characteristic "end_handle" using "Find Information req"

if remote device had declared the characteristic value_handle
at 0XFFFF (which also means there is no characteristic descriptors),then
present code would make start_handle has 0X0000(because of 16 bit
integer overflow) for "Find Information req"

desc_start = chrc_data->value_handle + 1;

Consequence:  Below request will be sent,
        ATT: Find Information req (0x04)
        start 0x0000, end 0xffff

        and below will be the proper response from the remote device
        ATT: Error (0x01)
        Error: Invalid handle (1)
        Find Information req (0x04) on handle 0x0000
---
src/shared/gatt-client.c |    6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/shared/gatt-client.c b/src/shared/gatt-client.c
index 7bc3b71..9b944ee 100644
--- a/src/shared/gatt-client.c
+++ b/src/shared/gatt-client.c
@@ -601,13 +601,13 @@ static bool discover_descs(struct discovery_op *op, bool *discovering)
chrc_data->value_handle)
goto failed;

- desc_start = chrc_data->value_handle + 1;
-
- if (desc_start > chrc_data->end_handle) {
+ if (chrc_data->value_handle >= chrc_data->end_handle) {
free(chrc_data);
continue;
}

+ desc_start = chrc_data->value_handle + 1;
+
client->discovery_req = bt_gatt_discover_descriptors(
client->att, desc_start,
chrc_data->end_handle,
-- 
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