stack: check flags on creation for future proofing

All API's should check that they support the flag values
passed. If an application passes an invalid flag it could
cause problems in later ABI.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Gage Eads <gage.eads@intel.com>

diff --git a/lib/librte_stack/rte_stack.c b/lib/librte_stack/rte_stack.c
index d19824f..e58fa54 100644 (file)
--- a/lib/librte_stack/rte_stack.c
+++ b/lib/librte_stack/rte_stack.c
@@ -59,6 +59,11 @@ rte_stack_create(const char *name, unsigned int count, int socket_id,
        unsigned int sz;
        int ret;
 
+       if (flags & ~(RTE_STACK_F_LF)) {
+               STACK_LOG_ERR("Unsupported stack flags %#x\n", flags);
+               return NULL;
+       }
+
 #ifdef RTE_ARCH_64
        RTE_BUILD_BUG_ON(sizeof(struct rte_stack_lf_head) != 16);
 #else