Fix a not properly handled pointer comparison that caused UB

am: 7f5c6593f2

Change-Id: I3a5115838bf239c3bda060a8a7fb4884b1f0e58f

1 files changed, 2 insertions, 2 deletions

diff --git a/gatekeeper_messages.cpp b/gatekeeper_messages.cpp
index fc76d5e..41972bb 100644
--- a/gatekeeper_messages.cpp
+++ b/gatekeeper_messages.cpp
@@ -52,8 +52,8 @@ static inline gatekeeper_error_t read_from_buffer(const uint8_t **buffer, const
     memcpy(&target->length, *buffer, sizeof(target->length));
     *buffer += sizeof(target->length);
     if (target->length != 0) {
-        const uint8_t *buffer_end = *buffer + target->length;
-        if (buffer_end > end || buffer_end <= *buffer) return ERROR_INVALID;
+        const size_t buffer_size = end - *buffer;
+        if (buffer_size < target->length) return ERROR_INVALID;
 
         target->buffer.reset(new uint8_t[target->length]);
         memcpy(target->buffer.get(), *buffer, target->length);