Improve offset check inside shmop_write().

diff --git a/ext/shmop/shmop.c b/ext/shmop/shmop.c
index 6fe70f30b401c0fc1caed7be9288162b7f41887b..ec292bd905e826f7d3912bf226f01ca509c8c979 100644 (file)
--- a/ext/shmop/shmop.c
+++ b/ext/shmop/shmop.c
@@ -310,7 +310,7 @@ PHP_FUNCTION(shmop_write)
                RETURN_FALSE;
        }
 
-       if (offset > shmop->size) {
+       if (offset < 0 || offset > shmop->size) {
                php_error_docref(NULL TSRMLS_CC, E_WARNING, "offset out of range");
                RETURN_FALSE;
        }