shared/gatt-client: Fix not checking valid ranges

From: Luiz Augusto von Dentz <[email protected]>

When attempting to update discovery ranges the code shall verify if the range is still valid (handles != 0x0000 and start < end).

---
 src/shared/gatt-client.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

index 45b6ed92fde1..cf0d2e2b749d 100644
@@ -1018,6 +1018,20 @@ static bool match_handle_range(const void *data, const void *match_data)
 					(match_range->start <= range->end);
 }
 
+static struct handle_range *range_new(uint16_t start, uint16_t end)
+{
+	struct handle_range *range;
+
+	if (!start || !end || start > end)
+		return NULL;
+
+	range = new0(struct handle_range, 1);
+	range->start = start;
+	range->end = end;
+
+	return range;
+}
+
 static void remove_discov_range(struct discovery_op *op, uint16_t start,
 								uint16_t end)
 {

@@ -1034,16 +1048,18 @@ static void remove_discov_range(struct discovery_op *op, uint16_t start,
 	if ((range->start == start) && (range->end == end)) {
 		queue_remove(op->discov_ranges, range);
 		free(range);
-	} else if (range->start == start)
+	} else if (range->start == start) {
 		range->start = end + 1;
-	else if (range->end == end)
+		if (!range->start || range->start > range->end) {
+			queue_remove(op->discov_ranges, range);
+			free(range);
+		}
+	} else if (range->end == end)
 		range->end = start - 1;
 	else {
-		new_range = new0(struct handle_range, 1);
-		new_range->start = end + 1;
-		new_range->end = range->end;
-
-		queue_push_after(op->discov_ranges, range, new_range);
+		new_range = range_new(end + 1, range->end);
+		if (new_range)
+			queue_push_after(op->discov_ranges, range, new_range);
 
 		range->end = start - 1;
 	}

2.37.3

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Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list. This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=701025

---Test result---

Test Summary:

CheckPatch                    PASS      0.52 seconds
GitLint                       PASS      0.35 seconds
BuildEll                      PASS      27.30 seconds
BluezMake                     PASS      867.15 seconds
MakeCheck                     PASS      11.62 seconds
MakeDistcheck                 PASS      145.87 seconds
CheckValgrind                 PASS      241.01 seconds
bluezmakeextell               PASS      94.09 seconds
IncrementalBuild              PASS      699.42 seconds
ScanBuild                     WARNING   991.88 seconds

Details
##############################
Test: ScanBuild - WARNING
Desc: Run Scan Build
Output:
src/shared/gatt-client.c:387:21: warning: Use of memory after it is freed

        gatt_db_unregister(op->client->db, op->db_id);
                           ^~~~~~~~~~
src/shared/gatt-client.c:600:2: warning: Use of memory after it is freed
        discovery_op_complete(op, false, att_ecode);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:900:2: warning: Use of memory after it is freed
        discovery_op_complete(op, success, att_ecode);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:1009:2: warning: Use of memory after it is freed
        discovery_op_complete(op, success, att_ecode);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:1201:2: warning: Use of memory after it is freed
        discovery_op_complete(op, success, att_ecode);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:1266:2: warning: Use of memory after it is freed
        discovery_op_complete(op, success, att_ecode);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:1537:6: warning: Use of memory after it is freed
        if (read_db_hash(op)) {
            ^~~~~~~~~~~~~~~~
src/shared/gatt-client.c:1542:2: warning: Use of memory after it is freed
        discover_all(op);
        ^~~~~~~~~~~~~~~~
src/shared/gatt-client.c:2044:6: warning: Use of memory after it is freed
        if (read_db_hash(op)) {
            ^~~~~~~~~~~~~~~~
src/shared/gatt-client.c:2052:8: warning: Use of memory after it is freed
                                                        discovery_op_ref(op),
                                                        ^~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:3135:2: warning: Use of memory after it is freed
        complete_write_long_op(req, success, 0, false);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/shared/gatt-client.c:3157:2: warning: Use of memory after it is freed
        request_unref(req);
        ^~~~~~~~~~~~~~~~~~

12 warnings generated.

---
Regards,
Linux Bluetooth