[PATCH net 1/1] ethtool: Fix mod state of verbose no_mask bitset

["Köry Maincent" <kory.maincent@bootlin.com>]

From: Kory Maincent <kory.maincent@bootlin.com>

A bitset without mask in a _SET request means we want exactly the bits in
the bitset to be set. This works correctly for compact format but when
verbose format is parsed, ethnl_update_bitset32_verbose() only sets the
bits present in the request bitset but does not clear the rest. The commit
6699170376ab fixes this issue by clearing the whole target bitmap before we
start iterating. The solution proposed brought an issue with the behavior
of the mod variable. As the bitset is always cleared the old val will
always differ to the new val.

Fix it by adding a new temporary variable which save the state of the old
bitmap.

Fixes: 6699170376ab ("ethtool: fix application of verbose no_mask bitset")
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Cc: stable@vger.kernel.org
---
 net/ethtool/bitset.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/net/ethtool/bitset.c b/net/ethtool/bitset.c
index 0515d6604b3b..95f11b0a38b4 100644
--- a/net/ethtool/bitset.c
+++ b/net/ethtool/bitset.c
@@ -432,7 +432,9 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
 			      struct netlink_ext_ack *extack, bool *mod)
 {
 	struct nlattr *bit_attr;
+	u32 *tmp = NULL;
 	bool no_mask;
+	bool dummy;
 	int rem;
 	int ret;
 
@@ -448,8 +450,11 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
 	}
 
 	no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
-	if (no_mask)
-		ethnl_bitmap32_clear(bitmap, 0, nbits, mod);
+	if (no_mask) {
+		tmp = kcalloc(nbits, sizeof(u32), GFP_KERNEL);
+		memcpy(tmp, bitmap, nbits);
+		ethnl_bitmap32_clear(bitmap, 0, nbits, &dummy);
+	}
 
 	nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
 		bool old_val, new_val;
@@ -458,13 +463,18 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
 		if (nla_type(bit_attr) != ETHTOOL_A_BITSET_BITS_BIT) {
 			NL_SET_ERR_MSG_ATTR(extack, bit_attr,
 					    "only ETHTOOL_A_BITSET_BITS_BIT allowed in ETHTOOL_A_BITSET_BITS");
-			return -EINVAL;
+			ret = -EINVAL;
+			goto out;
 		}
 		ret = ethnl_parse_bit(&idx, &new_val, nbits, bit_attr, no_mask,
 				      names, extack);
 		if (ret < 0)
-			return ret;
-		old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
+			goto out;
+		if (no_mask)
+			old_val = tmp[idx / 32] & ((u32)1 << (idx % 32));
+		else
+			old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
+
 		if (new_val != old_val) {
 			if (new_val)
 				bitmap[idx / 32] |= ((u32)1 << (idx % 32));
@@ -474,7 +484,10 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
 		}
 	}
 
-	return 0;
+	ret = 0;
+out:
+	kfree(tmp);
+	return ret;
 }
 
 static int ethnl_compact_sanity_checks(unsigned int nbits,
-- 
2.25.1