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From: Maciej Gajdzica <maciejx.t.gajdzica@intel.com>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH] table: fix a crash during key8 and key32 overload
Date: Mon, 23 Mar 2015 16:10:18 +0100
Message-ID: <1427123418-16238-1-git-send-email-maciejx.t.gajdzica@intel.com> (raw)

hash_key8_ext and hash_key32_ext tables allocate cache entries to
support table overload cases. The crash can occur when cache entry is
free after use. The problem is with computing the index of the free
cache entry. The same case for key16 was fixed with earlier patch.

Signed-off-by: Maciej Gajdzica <maciejx.t.gajdzica@intel.com>
---
 lib/librte_table/rte_table_hash_key32.c |    5 ++---
 lib/librte_table/rte_table_hash_key8.c  |    5 ++---
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/lib/librte_table/rte_table_hash_key32.c b/lib/librte_table/rte_table_hash_key32.c
index da0ce6a..6790594 100644
--- a/lib/librte_table/rte_table_hash_key32.c
+++ b/lib/librte_table/rte_table_hash_key32.c
@@ -540,9 +540,8 @@ rte_table_hash_entry_delete_key32_ext(
 
 					memset(bucket, 0,
 						sizeof(struct rte_bucket_4_32));
-					bucket_index = (bucket -
-						((struct rte_bucket_4_32 *)
-						f->memory)) - f->n_buckets;
+					bucket_index = (((uint8_t *)bucket -
+						(uint8_t *)f->memory)/f->bucket_size) - f->n_buckets;
 					f->stack[f->stack_pos++] = bucket_index;
 				}
 
diff --git a/lib/librte_table/rte_table_hash_key8.c b/lib/librte_table/rte_table_hash_key8.c
index 443ca7d..6803eb2 100644
--- a/lib/librte_table/rte_table_hash_key8.c
+++ b/lib/librte_table/rte_table_hash_key8.c
@@ -528,9 +528,8 @@ rte_table_hash_entry_delete_key8_ext(
 
 					memset(bucket, 0,
 						sizeof(struct rte_bucket_4_8));
-					bucket_index = (bucket -
-						((struct rte_bucket_4_8 *)
-						f->memory)) - f->n_buckets;
+					bucket_index = (((uint8_t *)bucket -
+						(uint8_t *)f->memory)/f->bucket_size) - f->n_buckets;
 					f->stack[f->stack_pos++] = bucket_index;
 				}
 
-- 
1.7.9.5

             reply	other threads:[~2015-03-23 15:11 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-23 15:10 Maciej Gajdzica [this message]
  -- strict thread matches above, loose matches on Subject: below --
2015-03-23 15:09 Maciej Gajdzica
2015-03-23 15:20 ` Dumitrescu, Cristian
2015-03-23 15:22   ` Walukiewicz, Miroslaw
2015-03-27 11:19   ` Thomas Monjalon

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