[PATCH 2/2] huaweimodem: ussd: ensure ussd content fits in buffer

Additional fix for CVE-2024-7539
---
 drivers/huaweimodem/ussd.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/huaweimodem/ussd.c b/drivers/huaweimodem/ussd.c
index 5e1c9078..1e246e5d 100644
--- a/drivers/huaweimodem/ussd.c
+++ b/drivers/huaweimodem/ussd.c
@@ -38,7 +38,7 @@ static void cusd_parse(GAtResult *result, struct ofono_ussd *ussd)
 	int status;
 	int dcs = 0;
 	const char *content;
-	unsigned char msg[160];
+	unsigned char msg[160] = {0};
 	const unsigned char *msg_ptr = NULL;
 	long msg_len;
 
@@ -55,6 +55,10 @@ static void cusd_parse(GAtResult *result, struct ofono_ussd *ussd)
 
 	g_at_result_iter_next_number(&iter, &dcs);
 
+	if (strlen(content) > sizeof(msg) * 2)
+		goto out;
+	}
+
 	msg_ptr = decode_hex_own_buf(content, -1, &msg_len, 0, msg);
 
 out:
-- 
2.45.2