Signed-off-by: Chris Wilson <[email protected]>
---
lib/igt_core.h | 14 ++++++++++++++
lib/ioctl_wrappers.c | 4 ++++
2 files changed, 18 insertions(+)
diff --git a/lib/igt_core.h b/lib/igt_core.h
index f8543d65..f5f65984 100644
--- a/lib/igt_core.h
+++ b/lib/igt_core.h
@@ -932,4 +932,18 @@ int igt_system_quiet(const char *command);
free(buf); \
} while (0)
+/**
+ * igt_typecheck:
+ * @type: The intended type we expect the variable to be
+ * @x: The variable we wish to check
+ *
+ * Performs a *compile-time* check that a variable is of a particular type.
+ */
+#define igt_typecheck(type, x) ({ \
+ type __dummy; \
+ typeof(x) __dummy2; \
+ (void)(&__dummy == &__dummy2); \
+ 1; \
+})
+
#endif /* IGT_CORE_H */
diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 87511fc6..0b523fac 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -558,6 +558,10 @@ int __gem_create(int fd, uint64_t size, uint32_t *handle)
};
int err = 0;
+ /* Ensure that our internal interface matches the kernel's */
+ igt_typecheck(typeof(create.size), size);
+ igt_typecheck(typeof(create.handle), *handle);
+
if (igt_ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create) == 0)
*handle = create.handle;
else
--
2.14.2
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