mem: fix resource leak

Segment preallocation code allocates an array of structures on the
heap but does not free the memory afterwards. Fix it by freeing it
at the end of the function, and changing control flow to always go
through that code path.

Coverity issue: 323524
Fixes: 1dd342d0fdc4 ("mem: improve segment list preallocation")
Cc: stable@dpdk.org
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>

diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 19e686e..fce86fd 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -2135,7 +2135,7 @@ memseg_primary_init(void)
                uint64_t page_sz;
                int socket_id;
        } *memtypes = NULL;
-       int i, hpi_idx, msl_idx;
+       int i, hpi_idx, msl_idx, ret = -1; /* fail unless told to succeed */
        struct rte_memseg_list *msl;
        uint64_t max_mem, max_mem_per_type;
        unsigned int max_seglists_per_type;
@@ -2227,7 +2227,7 @@ memseg_primary_init(void)
        if (max_seglists_per_type == 0) {
                RTE_LOG(ERR, EAL, "Cannot accommodate all memory types, please increase %s\n",
                        RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
-               return -1;
+               goto out;
        }
 
        /* go through all mem types and create segment lists */
@@ -2287,21 +2287,25 @@ memseg_primary_init(void)
                                RTE_LOG(ERR, EAL,
                                        "No more space in memseg lists, please increase %s\n",
                                        RTE_STR(CONFIG_RTE_MAX_MEMSEG_LISTS));
-                               return -1;
+                               goto out;
                        }
                        msl = &mcfg->memsegs[msl_idx++];
 
                        if (alloc_memseg_list(msl, pagesz, n_segs,
                                        socket_id, cur_seglist))
-                               return -1;
+                               goto out;
 
                        if (alloc_va_space(msl)) {
                                RTE_LOG(ERR, EAL, "Cannot allocate VA space for memseg list\n");
-                               return -1;
+                               goto out;
                        }
                }
        }
-       return 0;
+       /* we're successful */
+       ret = 0;
+out:
+       free(memtypes);
+       return ret;
 }
 
 static int