mbuf: check shared memory before dumping dynamic space

Because mbuf dyn shared memory was allocated runtime, so it's
necessary to check validity when dump mbuf dyn info.

Also this patch adds an error logging when init shared memory fail.

Fixes: 4958ca3a443a ("mbuf: support dynamic fields and flags")
Cc: stable@dpdk.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/lib/mbuf/rte_mbuf_dyn.c b/lib/mbuf/rte_mbuf_dyn.c
index 7d5e942..ca46eb2 100644 (file)
--- a/lib/mbuf/rte_mbuf_dyn.c
+++ b/lib/mbuf/rte_mbuf_dyn.c
@@ -115,8 +115,10 @@ init_shared_mem(void)
        } else {
                mz = rte_memzone_lookup(RTE_MBUF_DYN_MZNAME);
        }
-       if (mz == NULL)
+       if (mz == NULL) {
+               RTE_LOG(ERR, MBUF, "Failed to get mbuf dyn shared memory\n");
                return -1;
+       }
 
        shm = mz->addr;
 
@@ -525,7 +527,11 @@ void rte_mbuf_dyn_dump(FILE *out)
        size_t i;
 
        rte_mcfg_tailq_write_lock();
-       init_shared_mem();
+       if (init_shared_mem() < 0) {
+               rte_mcfg_tailq_write_unlock();
+               return;
+       }
+
        fprintf(out, "Reserved fields:\n");
        mbuf_dynfield_list = RTE_TAILQ_CAST(
                mbuf_dynfield_tailq.head, mbuf_dynfield_list);