[PATCH BlueZ v3 3/4] src/shared: add nullity checks

[Ismagil Iskakov <i.iskakov@omp.ru>]

Check util_iov_pull_mem where iov len is not verified
beforehand. Check vcp_get_vcs for NULL.
These changes are based on other usages where those
checks exist.
---
 src/shared/bap.c | 23 +++++++++++++++++++++++
 src/shared/vcp.c |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/src/shared/bap.c b/src/shared/bap.c
index ba6f75ff2..37f70ae55 100644
--- a/src/shared/bap.c
+++ b/src/shared/bap.c
@@ -7568,6 +7568,11 @@ bool bt_bap_parse_base(uint8_t sid, struct iovec *iov,
 
 		codec = util_iov_pull_mem(iov, sizeof(*codec));
 
+		if (!codec) {
+			ret = false;
+			goto done;
+		}
+
 		util_debug(func, NULL, "Codec: ID %d CID 0x%2.2x VID 0x%2.2x",
 				codec->id, codec->cid, codec->vid);
 
@@ -7579,6 +7584,12 @@ bool bt_bap_parse_base(uint8_t sid, struct iovec *iov,
 		}
 
 		l2_cc.iov_base = util_iov_pull_mem(iov, l2_cc_len);
+
+		if (!l2_cc.iov_base) {
+			ret = false;
+			goto done;
+		}
+
 		l2_cc.iov_len = l2_cc_len;
 
 		/* Print Codec Specific Configuration */
@@ -7593,6 +7604,12 @@ bool bt_bap_parse_base(uint8_t sid, struct iovec *iov,
 		}
 
 		meta.iov_base = util_iov_pull_mem(iov, meta_len);
+
+		if (!meta.iov_base) {
+			ret = false;
+			goto done;
+		}
+
 		meta.iov_len = meta_len;
 
 		/* Print Metadata */
@@ -7623,6 +7640,12 @@ bool bt_bap_parse_base(uint8_t sid, struct iovec *iov,
 
 			l3_cc.iov_base = util_iov_pull_mem(iov,
 							l3_cc_len);
+
+			if (!l3_cc.iov_base) {
+				ret = false;
+				goto done;
+			}
+			
 			l3_cc.iov_len = l3_cc_len;
 
 			/* Print Codec Specific Configuration */
diff --git a/src/shared/vcp.c b/src/shared/vcp.c
index e614ff61f..be002ad4c 100644
--- a/src/shared/vcp.c
+++ b/src/shared/vcp.c
@@ -2934,6 +2934,9 @@ static void foreach_vcs_service(struct gatt_db_attribute *attr,
 	struct bt_vcp *vcp = user_data;
 	struct bt_vcs *vcs = vcp_get_vcs(vcp);
 
+	if (!vcs)
+		return;
+
 	vcs->service = attr;
 
 	gatt_db_service_set_claimed(attr, true);
-- 
2.34.1