From 661e1db826cc3dd99c5acc5ad768bb7e28fe59d3 Mon Sep 17 00:00:00 2001
From: Ilia Shipitsin <chipitsine@gmail.com>
Date: Mon, 5 Aug 2024 20:59:09 +0200
Subject: [PATCH] DEV: coccinelle: add a test to detect unchecked strdup()

The coccinelle test "unchecked-strdup.cocci" detects various cases of
unchecked strdup().
---
 dev/coccinelle/unchecked-strdup.cocci | 34 +++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 dev/coccinelle/unchecked-strdup.cocci

diff --git a/dev/coccinelle/unchecked-strdup.cocci b/dev/coccinelle/unchecked-strdup.cocci
new file mode 100644
index 000000000..fa109aaf1
--- /dev/null
+++ b/dev/coccinelle/unchecked-strdup.cocci
@@ -0,0 +1,34 @@
+// find calls to strdup
+@call@
+expression ptr;
+position p;
+@@
+
+ptr@p = strdup(...);
+
+// find ok calls to strdup
+@ok@
+expression ptr;
+position call.p;
+@@
+
+ptr@p = strdup(...);
+... when != ptr
+(
+ (ptr == NULL || ...)
+|
+ (ptr == 0 || ...)
+|
+ (ptr != NULL || ...)
+|
+ (ptr != 0 || ...)
+)
+
+// fix bad calls to strdup
+@depends on !ok@
+expression ptr;
+position call.p;
+@@
+
+ptr@p = strdup(...);
++ if (ptr == NULL) return;