netdev - [PATCH net-next] netlabel: remove impossible return value in netlbl_bitmap

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Date: Tue, 27 Feb 2024 17:36:04 +0800
From: Zhengchao Shao <shaozhengchao@...wei.com>
To: <netdev@...r.kernel.org>, <linux-security-module@...r.kernel.org>,
	<davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>
CC: <paul@...l-moore.com>, <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>,
	<shaozhengchao@...wei.com>
Subject: [PATCH net-next] netlabel: remove impossible return value in netlbl_bitmap_walk

Since commit 446fda4f2682 ("[NetLabel]: CIPSOv4 engine"), *bitmap_walk
function only returns -1. Nearly 18 years have passed, -2 scenes never
come up, so there's no need to consider it.

Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 net/ipv4/cipso_ipv4.c        | 5 +----
 net/ipv6/calipso.c           | 5 +----
 net/netlabel/netlabel_kapi.c | 2 +-
 3 files changed, 3 insertions(+), 9 deletions(-)

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index d048aa833293..8b17d83e5fde 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -864,11 +864,8 @@ static int cipso_v4_map_cat_rbm_ntoh(const struct cipso_v4_doi *doi_def,
 					      net_clen_bits,
 					      net_spot + 1,
 					      1);
-		if (net_spot < 0) {
-			if (net_spot == -2)
-				return -EFAULT;
+		if (net_spot < 0)
 			return 0;
-		}
 
 		switch (doi_def->type) {
 		case CIPSO_V4_MAP_PASS:
diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
index 1578ed9e97d8..eb8ee1e9373a 100644
--- a/net/ipv6/calipso.c
+++ b/net/ipv6/calipso.c
@@ -657,11 +657,8 @@ static int calipso_map_cat_ntoh(const struct calipso_doi *doi_def,
 					  net_clen_bits,
 					  spot + 1,
 					  1);
-		if (spot < 0) {
-			if (spot == -2)
-				return -EFAULT;
+		if (spot < 0)
 			return 0;
-		}
 
 		ret_val = netlbl_catmap_setbit(&secattr->attr.mls.cat,
 					       spot,
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 7b844581ebee..1ba4f58e1d35 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -876,7 +876,7 @@ int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
  * Description:
  * Starting at @offset, walk the bitmap from left to right until either the
  * desired bit is found or we reach the end.  Return the bit offset, -1 if
- * not found, or -2 if error.
+ * not found.
  */
 int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
 		       u32 offset, u8 state)
-- 
2.34.1