[dpdk-dev] [PATCH v2] enic: negative array index write

[John Daley <johndale@cisco.com>]

Negative array index write using variable pos as an index to array
enic->fdir.nodes. Fixed by add array index check.

Fixes: fefed3d1e62c ("enic: new driver") Coverity ID 13270
Signed-off-by: John Daley <johndale@cisco.com>
---

Here is a version 2. Differences with fix proposed by Slawomir Mrozowicz:
- handle the return code error condition for both calls to rte_hash_add_key()
  not just the the 2nd one.
- no need to check for pos >= ENICPMD_FDIR_MAX since it should already be
  validated by rte_hash_add_key(). rte_hash_create() takes an 'entries'
  parameter which is used to cap the max return value of rte_hash_add_key().
- when pos is < 0, return the actual error (pos), instead of -EINVAL.

 drivers/net/enic/enic_clsf.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/enic/enic_clsf.c b/drivers/net/enic/enic_clsf.c
index edb56e1..7d2bb78 100644
--- a/drivers/net/enic/enic_clsf.c
+++ b/drivers/net/enic/enic_clsf.c
@@ -148,9 +148,13 @@ int enic_fdir_add_fltr(struct enic *enic, struct rte_eth_fdir_filter *params)
 		enic->fdir.nodes[pos] = NULL;
 		if (unlikely(key->rq_index == queue)) {
 			/* Nothing to be done */
+			enic->fdir.stats.f_add++;
 			pos = rte_hash_add_key(enic->fdir.hash, params);
+			if (pos < 0) {
+				dev_err(enic, "Add hash key failed\n");
+				return pos;
+			}
 			enic->fdir.nodes[pos] = key;
-			enic->fdir.stats.f_add++;
 			dev_warning(enic,
 				"FDIR rule is already present\n");
 			return 0;
@@ -213,6 +217,11 @@ int enic_fdir_add_fltr(struct enic *enic, struct rte_eth_fdir_filter *params)
 	}
 
 	pos = rte_hash_add_key(enic->fdir.hash, params);
+	if (pos < 0) {
+		dev_err(enic, "Add hash key failed\n");
+		return pos;
+	}
+
 	enic->fdir.nodes[pos] = key;
 	return 0;
 }
-- 
2.7.0