ucode: check calloc return in uc_uclient_new

If calloc failed, the following ucl->cb.* assignments dereferenced a
NULL pointer. Return NULL on allocation failure.

Assisted-by: Claude:claude-opus-4-7
Link: https://github.com/openwrt/uclient/pull/16
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/ucode.c b/ucode.c
index ba65e63..119969e 100644
--- a/ucode.c
+++ b/ucode.c
@@ -508,6 +508,9 @@ uc_uclient_new(uc_vm_t *vm, size_t nargs)
 		return NULL;
 
 	ucl = calloc(1, sizeof(*ucl));
+	if (!ucl)
+		return NULL;
+
 	if (ucv_property_get(cb, "data_read"))
 		ucl->cb.data_read = uc_cb_data_read;
 	if (ucv_property_get(cb, "get_post_data"))