tal/talloc: new module for backending tal onto talloc.

[ccan] / ccan / tal / talloc / test / run-overflow.c

diff --git a/ccan/tal/talloc/test/run-overflow.c b/ccan/tal/talloc/test/run-overflow.c
new file mode 100644 (file)
index 0000000..c7f9c18
--- /dev/null
+++ b/ccan/tal/talloc/test/run-overflow.c
@@ -0,0 +1,100 @@
+#include <ccan/tal/talloc/talloc.h>
+#include <ccan/tal/talloc/talloc.c>
+#include <ccan/tap/tap.h>
+
+static int error_count;
+
+static void my_error(const char *msg)
+{
+       error_count++;
+}
+
+int main(void)
+{
+       void *p;
+       int *pi, *origpi;
+       char *cp;
+
+       plan_tests(30);
+
+       tal_set_backend(NULL, NULL, NULL, my_error);
+       talloc_enable_null_tracking_no_autofree();
+
+       p = tal_arr(NULL, int, (size_t)-1);
+       ok1(!p);
+       ok1(error_count == 1);
+
+       p = tal_arr(NULL, char, (size_t)-2);
+       ok1(!p);
+       ok1(error_count == 2);
+
+       /* Now try overflow cases for tal_dup. */
+       error_count = 0;
+       origpi = tal_arr(NULL, int, 100);
+       ok1(origpi);
+       ok1(error_count == 0);
+       pi = tal_dup(NULL, int, origpi, (size_t)-1, 0);
+       ok1(!pi);
+       ok1(error_count == 1);
+       pi = tal_dup(NULL, int, origpi, 0, (size_t)-1);
+       ok1(!pi);
+       ok1(error_count == 2);
+
+       pi = tal_dup(NULL, int, origpi, (size_t)-1UL / sizeof(int),
+                    (size_t)-1UL / sizeof(int));
+       ok1(!pi);
+       ok1(error_count == 3);
+       /* This will still overflow when tal_hdr is added. */
+       pi = tal_dup(NULL, int, origpi, (size_t)-1UL / sizeof(int) / 2,
+                    (size_t)-1UL / sizeof(int) / 2);
+       ok1(!pi);
+       ok1(error_count == 4);
+       ok1(talloc_total_blocks(NULL) == 2);
+       tal_free(origpi);
+
+       /* Now, check that with taltk() we free old one on failure. */
+       origpi = tal_arr(NULL, int, 100);
+       error_count = 0;
+       pi = tal_dup(NULL, int, take(origpi), (size_t)-1, 0);
+       ok1(!pi);
+       ok1(error_count == 1);
+
+       origpi = tal_arr(NULL, int, 100);
+       error_count = 0;
+       pi = tal_dup(NULL, int, take(origpi), 0, (size_t)-1);
+       ok1(!pi);
+       ok1(error_count == 1);
+       ok1(talloc_total_blocks(NULL) == 1);
+
+       origpi = tal_arr(NULL, int, 100);
+       error_count = 0;
+       pi = tal_dup(NULL, int, take(origpi), (size_t)-1UL / sizeof(int),
+                    (size_t)-1UL / sizeof(int));
+       ok1(!pi);
+       ok1(error_count == 1);
+       ok1(talloc_total_blocks(NULL) == 1);
+
+       origpi = tal_arr(NULL, int, 100);
+       error_count = 0;
+       /* This will still overflow when tal_hdr is added. */
+       pi = tal_dup(NULL, int, take(origpi), (size_t)-1UL / sizeof(int) / 2,
+                    (size_t)-1UL / sizeof(int) / 2);
+       ok1(!pi);
+       ok1(error_count == 1);
+       ok1(talloc_total_blocks(NULL) == 1);
+
+       /* Overflow on expand addition. */
+       cp = tal_arr(p, char, 100);
+       ok1(!tal_expand(&cp, NULL, (size_t)-99UL));
+       ok1(error_count == 2);
+       tal_free(cp);
+
+       /* Overflow when multiplied by size */
+       origpi = tal_arr(NULL, int, 100);
+       ok1(!tal_expand(&origpi, NULL, (size_t)-1UL / sizeof(int)));
+       ok1(error_count == 3);
+       tal_free(origpi);
+
+       talloc_disable_null_tracking();
+       return exit_status();
+}