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From: Wei Zhao <wei.zhao1@intel.com>
To: dev@dpdk.org
Cc: stable@dpdk.org, xiaolong.ye@intel.com, jia.guo@intel.com,
	Wei Zhao <wei.zhao1@intel.com>
Subject: [dpdk-stable] [PATCH v4] net/i40e: fix the core dump risk of wild pointer operation
Date: Mon, 18 May 2020 15:43:30 +0800
Message-ID: <20200518074330.35840-1-wei.zhao1@intel.com> (raw)
In-Reply-To: <20200518064324.34859-1-wei.zhao1@intel.com>

In i40e PMD code of function i40e_res_pool_free(), if valid_entry
is freed by "rte_free(valid_entry);" in the code, then the following
code for pool update may still use the wild pointer "valid_entry"
for pool info update. It seems has the risk of core dump for
using wild pointer operation, we should avoid this risk.

Cc: stable@dpdk.org
Fixes: 4861cde46116 ("i40e: new poll mode driver")

Signed-off-by: Wei Zhao <wei.zhao1@intel.com>

---

v2:
update commit log

v3:
set free pointer to NULL

v4:
change code style
---
 drivers/net/i40e/i40e_ethdev.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 749d85f54..679d59e5d 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -4935,6 +4935,7 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool,
 {
 	struct pool_entry *entry, *next, *prev, *valid_entry = NULL;
 	uint32_t pool_offset;
+	uint16_t len;
 	int insert;
 
 	if (pool == NULL) {
@@ -4973,12 +4974,13 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool,
 	}
 
 	insert = 0;
+	len = valid_entry->len;
 	/* Try to merge with next one*/
 	if (next != NULL) {
 		/* Merge with next one */
-		if (valid_entry->base + valid_entry->len == next->base) {
+		if (valid_entry->base + len == next->base) {
 			next->base = valid_entry->base;
-			next->len += valid_entry->len;
+			next->len += len;
 			rte_free(valid_entry);
 			valid_entry = next;
 			insert = 1;
@@ -4987,14 +4989,16 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool,
 
 	if (prev != NULL) {
 		/* Merge with previous one */
-		if (prev->base + prev->len == valid_entry->base) {
-			prev->len += valid_entry->len;
+		if (prev->base + len == valid_entry->base) {
+			prev->len += len;
 			/* If it merge with next one, remove next node */
 			if (insert == 1) {
 				LIST_REMOVE(valid_entry, next);
 				rte_free(valid_entry);
+				valid_entry = NULL;
 			} else {
 				rte_free(valid_entry);
+				valid_entry = NULL;
 				insert = 1;
 			}
 		}
@@ -5010,8 +5014,8 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool,
 			LIST_INSERT_HEAD(&pool->free_list, valid_entry, next);
 	}
 
-	pool->num_free += valid_entry->len;
-	pool->num_alloc -= valid_entry->len;
+	pool->num_free += len;
+	pool->num_alloc -= len;
 
 	return 0;
 }
-- 
2.19.1


  reply	other threads:[~2020-05-18  8:06 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12 15:19 [dpdk-stable] [PATCH] net/i40e: fix the security " Wei Zhao
2020-05-15  2:24 ` Zhao1, Wei
2020-05-15  6:32 ` [dpdk-stable] [dpdk-dev] " Jeff Guo
2020-05-15  7:28   ` Ye Xiaolong
2020-05-18  5:24     ` Zhao1, Wei
2020-05-18  5:32       ` Ye Xiaolong
2020-05-18  5:10 ` [dpdk-stable] [PATCH v2] net/i40e: fix the core dump " Wei Zhao
2020-05-18  6:43   ` [dpdk-stable] [PATCH v3] " Wei Zhao
2020-05-18  7:43     ` Wei Zhao [this message]
2020-05-18  8:00       ` [dpdk-stable] [PATCH v5] " Wei Zhao
2020-05-18  8:45         ` Jeff Guo
2020-05-19  1:28         ` Ye Xiaolong

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