[dpdk-dev] [PATCH] mem: fix cleanup after incomplete initialization

[Dmitry Kozlyuk]

In case of EAL initialization failure rte_eal_memory_detach() may be
called before mapping memory configuration, which in this case points
to the static structure. Attempt to unmap it yields error:

    EAL: Could not unmap shared memory config: Invalid argument

Skip unmapping memory configuration if it's not yet shared.

Fixes: dfbc61a2f9a6 ("mem: detach memsegs on cleanup")
Cc: Anatoly Burakov <anatoly.burakov at intel.com>

Reported-by: David Marchand <david.marchand at redhat.com>
Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
---
 lib/librte_eal/common/eal_common_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/eal_common_memory.c b/lib/librte_eal/common/eal_common_memory.c
index 2581dd5f58..f83b75092e 100644
--- a/lib/librte_eal/common/eal_common_memory.c
+++ b/lib/librte_eal/common/eal_common_memory.c
@@ -1055,7 +1055,7 @@ rte_eal_memory_detach(void)
 	 * config - we can't zero it out because it might still be referenced
 	 * by other processes.
 	 */
-	if (internal_conf->no_shconf == 0) {
+	if (internal_conf->no_shconf == 0 && mcfg->mem_cfg_addr != 0) {
 		if (rte_mem_unmap(mcfg, RTE_ALIGN(sizeof(*mcfg), page_sz)) != 0)
 			RTE_LOG(ERR, EAL, "Could not unmap shared memory config: %s\n",
 					rte_strerror(rte_errno));
-- 
2.29.3