[PATCH BlueZ v1 2/4] shared: prevent dereferencing of NULL pointers

[Roman Smirnov <r.smirnov@xxxxxx>]

It is necessary to add checks for NULL before dereferencing pointers.

Found with the SVACE static analysis tool.
---
 src/shared/micp.c |  4 ++++
 src/shared/vcp.c  | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/shared/micp.c b/src/shared/micp.c
index b82bd92de..1c34e9d00 100644
--- a/src/shared/micp.c
+++ b/src/shared/micp.c
@@ -398,6 +398,10 @@ static void mics_mute_write(struct gatt_db_attribute *attrib,
 	}
 
 	micp_op = iov_pull_mem(&iov, sizeof(*micp_op));
+	if (!micp_op) {
+		DBG(micp, "iov_pull_mem() returned NULL");
+		goto respond;
+	}
 
 	if ((*micp_op == MICS_DISABLED) || (*micp_op != MICS_NOT_MUTED
 		&& *micp_op != MICS_MUTED)) {
diff --git a/src/shared/vcp.c b/src/shared/vcp.c
index 06264a241..602d46dc1 100644
--- a/src/shared/vcp.c
+++ b/src/shared/vcp.c
@@ -925,6 +925,10 @@ static void vcs_cp_write(struct gatt_db_attribute *attrib,
 	}
 
 	vcp_op = iov_pull_mem(&iov, sizeof(*vcp_op));
+	if (!vcp_op) {
+		DBG(vcp, "iov_pull_mem() returned NULL");
+		goto respond;
+	}
 
 	for (handler = vcp_handlers; handler && handler->str; handler++) {
 		if (handler->op != *vcp_op)
@@ -985,6 +989,10 @@ static void vocs_cp_write(struct gatt_db_attribute *attrib,
 	}
 
 	vcp_op = iov_pull_mem(&iov, sizeof(*vcp_op));
+	if (!vcp_op) {
+		DBG(vcp, "iov_pull_mem() returned NULL");
+		goto respond;
+	}
 
 	for (handler = vocp_handlers; handler && handler->str; handler++) {
 		if (handler->op != *vcp_op)
@@ -1517,6 +1525,10 @@ static void aics_ip_cp_write(struct gatt_db_attribute *attrib,
 	}
 
 	aics_op = iov_pull_mem(&iov, sizeof(*aics_op));
+	if (!aics_op) {
+		DBG(vcp, "iov_pull_mem() returned NULL");
+		goto respond;
+	}
 
 	for (handler = aics_handlers; handler && handler->str; handler++) {
 		if (handler->op != *aics_op)
-- 
2.34.1