netlink: fix missing headers in text output.

Resolves: RHEL-106544

Signed-off-by: Mohammad Heib <mheib@redhat.com>

0001-netlink-fix-missing-headers-in-text-output.patch

@@ -0,0 +1,64 @@
+From b70c928661024cd07914feb49122275daab904ea Mon Sep 17 00:00:00 2001
+From: Jakub Kicinski <kuba@kernel.org>
+Date: Sat, 12 Jul 2025 07:51:05 -0700
+Subject: [PATCH] netlink: fix missing headers in text output
+
+The commit under fixes added a NULL-check which prevents us from
+printing text headers. Conversions to add JSON support often use:
+
+  print_string(PRINT_FP, NULL, "some text:\n", NULL);
+
+to print in plain text mode.
+
+Correct output:
+
+  Channel parameters for vpn0:
+  Pre-set maximums:
+  RX:		n/a
+  TX:		n/a
+  Other:		n/a
+  Combined:	1
+  Current hardware settings:
+  RX:		n/a
+  TX:		n/a
+  Other:		n/a
+  Combined:	0
+
+With the buggy patch:
+
+  Channel parameters for vpn0:
+  RX:		n/a
+  TX:		n/a
+  Other:		n/a
+  Combined:	1
+  RX:		n/a
+  TX:		n/a
+  Other:		n/a
+  Combined:	0
+
+Fixes: fd328ccb3cc0 ("json_print: add NULL check before jsonw_string_field() in print_string()")
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ json_print.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/json_print.c b/json_print.c
+index 4f61640..e07c651 100644
+--- a/json_print.c
++++ b/json_print.c
+@@ -143,10 +143,11 @@ void print_string(enum output_type type,
+ 	} else if (_IS_FP_CONTEXT(type)) {
+ 		if (value)
+ 			fprintf(stdout, fmt, value);
++		else
++			fprintf(stdout, "%s", fmt);
+ 	}
+ }
+ 
+-
+ /*
+  * value's type is bool. When using this function in FP context you can't pass
+  * a value to it, you will need to use "is_json_context()" to have different
+-- 
+2.49.0
+

ethtool.spec

@@ -2,13 +2,14 @@ Summary:        Settings tool for Ethernet NICs
 Name:           ethtool
 Epoch:          2
 Version:        6.15
-Release:        1%{?dist}
+Release:        2%{?dist}
 # {json_print,qsfp,sff-common}.{c,h} are GPL-2.0-or-later, rest is GPL-2.0-only
 License:        GPL-2.0-only AND GPL-2.0-or-later
 URL:            https://www.kernel.org/pub/software/network/%{name}/
 Source0:        https://www.kernel.org/pub/software/network/%{name}/%{name}-%{version}.tar.xz
 Source1:        https://www.kernel.org/pub/software/network/%{name}/%{name}-%{version}.tar.sign
 Source2:        https://keys.openpgp.org/vks/v1/by-fingerprint/D2CB120AB45957B721CD9596F4554567B91DE934
+Patch0:         0001-netlink-fix-missing-headers-in-text-output.patch
 BuildRequires:  gnupg2, xz
 BuildRequires:  gcc
 BuildRequires:  libmnl-devel
@@ -22,7 +23,7 @@ network devices, especially of Ethernet devices.
 
 %prep
 xzcat '%{SOURCE0}' | %{gpgverify} --keyring='%{SOURCE2}' --signature='%{SOURCE1}' --data=-
-%autosetup
+%autosetup -p1
 
 %build
 %configure
@@ -45,6 +46,10 @@ make check
 %{_datadir}/metainfo/org.kernel.software.network.ethtool.metainfo.xml
 
 %changelog
+* Fri Aug 01 2025 Mohammad Heib <mheib@redhat.com>
+- netlink: fix missing headers in text output.
+  Resolves: RHEL-106544
+
 * Tue Jun 24 2025 Mohammad Heib <mheib@redhat.com> - 2:6.15-1
 - Update to latest upstream release v6.15.
   Resolves RHEL-99667.