[dpdk-dev] [PATCH] hash: fix use after free in thash

[Vladimir Medvedkin]

This patch fixes use after free in thash library, reported by ASAN.

Bugzilla ID: 868
Fixes: 28ebff11c2dc ("hash: add predictable RSS")

Signed-off-by: Vladimir Medvedkin <vladimir.medved...@intel.com>
---
 lib/hash/rte_thash.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/hash/rte_thash.c b/lib/hash/rte_thash.c
index 696a112..7a284a7 100644
--- a/lib/hash/rte_thash.c
+++ b/lib/hash/rte_thash.c
@@ -416,10 +416,10 @@ insert_before(struct rte_thash_ctx *ctx,
                        return ret;
                }
        } else if ((next_ent != NULL) && (end > next_ent->offset)) {
-               rte_free(ent);
                RTE_LOG(ERR, HASH,
                        "Can't add helper %s due to conflict with existing"
                        " helper %s\n", ent->name, next_ent->name);
+               rte_free(ent);
                return -ENOSPC;
        }
        attach_lfsr(ent, cur_ent->lfsr);
@@ -465,10 +465,10 @@ insert_after(struct rte_thash_ctx *ctx,
        int ret;
 
        if ((next_ent != NULL) && (end > next_ent->offset)) {
-               rte_free(ent);
                RTE_LOG(ERR, HASH,
                        "Can't add helper %s due to conflict with existing"
                        " helper %s\n", ent->name, next_ent->name);
+               rte_free(ent);
                return -EEXIST;
        }
 
-- 
2.7.4