netdev - [PATCH net] netconsole: fix appending sysdata when sysdata_fields == SYSDATA

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Message-Id: <20250609-netconsole-fix-v1-1-17543611ae31@gmail.com>
Date: Mon, 09 Jun 2025 11:24:20 -0700
From: Gustavo Luiz Duarte <gustavold@...il.com>
To: Breno Leitao <leitao@...ian.org>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Gustavo Luiz Duarte <gustavold@...il.com>
Subject: [PATCH net] netconsole: fix appending sysdata when sysdata_fields
 == SYSDATA_RELEASE

Before appending sysdata, prepare_extradata() checks if any feature is
enabled in sysdata_fields (and exits early if none is enabled).

When SYSDATA_RELEASE was introduced, we missed adding it to the list of
features being checked against sysdata_fields in prepare_extradata().
The result was that, if only SYSDATA_RELEASE is enabled in
sysdata_fields, we incorreclty exit early and fail to append the
release.

Instead of checking specific bits in sysdata_fields, check if
sysdata_fields has ALL bit zeroed and exit early if true. This fixes
case when only SYSDATA_RELEASE enabled and makes the code more general /
less error prone in future feature implementation.

Signed-off-by: Gustavo Luiz Duarte <gustavold@...il.com>
---
 drivers/net/netconsole.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 4289ccd3e41b..176935a8645f 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -1252,7 +1252,6 @@ static int sysdata_append_release(struct netconsole_target *nt, int offset)
  */
 static int prepare_extradata(struct netconsole_target *nt)
 {
-	u32 fields = SYSDATA_CPU_NR | SYSDATA_TASKNAME;
 	int extradata_len;

 	/* userdata was appended when configfs write helper was called
@@ -1260,7 +1259,7 @@ static int prepare_extradata(struct netconsole_target *nt)
 	 */
 	extradata_len = nt->userdata_length;

-	if (!(nt->sysdata_fields & fields))
+	if (!nt->sysdata_fields)
 		goto out;

 	if (nt->sysdata_fields & SYSDATA_CPU_NR)

---
base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
change-id: 20250609-netconsole-fix-5465e2fd8f83

Best regards,
-- 
Gustavo Luiz Duarte <gustavold@...il.com>