[PATCH 08/28] devlink: Refactor strlcat() to seq_buf in __devlink_compat_running_version()
From: Bill Wendling
Date: Tue Sep 15 2026 - 04:36:06 EST
__devlink_compat_running_version() appends running firmware version
strings and spaces to "buf" inside nested netlink attribute loops using
strlcat(), rescanning "buf" on every iteration.
In preparation for removing the deprecated strlcat() API[1], use struct
seq_buf anchored at the current length of "buf" and append each version
entry with seq_buf_printf().
Link: https://github.com/KSPP/linux/issues/370 [1]
Cc: codemender-patching+linux@xxxxxxxxxx
Assisted-by: CoPilot:v1 [editor_update_file, shell_command_run]
Signed-off-by: Bill Wendling <morbo@xxxxxxxxxx>
---
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: WANG Xuerui <kernel@xxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Simona Vetter <simona@xxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Cc: "Thomas Hellström" <thomas.hellstrom@xxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Matthias Schwarzott <zzam@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Cc: Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>
Cc: Andrew Lunn <andrew+netdev@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Saravana Kannan <saravanak@xxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Cc: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Cc: Peter Griffin <peter.griffin@xxxxxxxxxx>
Cc: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Cc: Linus Walleij <linusw@xxxxxxxxxx>
Cc: Anil Gurumurthy <anil.gurumurthy@xxxxxxxxxx>
Cc: Sudarsana Kalluru <sudarsana.kalluru@xxxxxxxxxx>
Cc: "Martin K. Petersen" <mkp@xxxxxxxxxx>
Cc: Trond Myklebust <trondmy@xxxxxxxxxx>
Cc: Anna Schumaker <anna@xxxxxxxxxx>
Cc: Mike Marshall <hubcap@xxxxxxxxxxxx>
Cc: Martin Brandenburg <martin@xxxxxxxxxxxx>
Cc: Kees Cook <kees@xxxxxxxxxx>
Cc: Jiri Pirko <jiri@xxxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxx>
Cc: Chuck Lever <cel@xxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: NeilBrown <neil@xxxxxxxxxx>
Cc: Olga Kornievskaia <okorniev@xxxxxxxxxx>
Cc: Dai Ngo <Dai.Ngo@xxxxxxxxxx>
Cc: Tom Talpey <tom@xxxxxxxxxx>
Cc: Jaroslav Kysela <perex@xxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxxx>
Cc: Bill Wendling <morbo@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>
Cc: Kanglong Wang <wangkanglong@xxxxxxxxxxx>
Cc: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
Cc: Qiang Ma <maqianga@xxxxxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Pengpeng Hou <pengpeng@xxxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Breno Leitao <leitao@xxxxxxxxxx>
Cc: Thorsten Blum <blum@xxxxxxxxxx>
Cc: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Ashutosh Desai <ashutoshdesai993@xxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
Cc: Johan Hovold <johan@xxxxxxxxxx>
Cc: Johannes Berg <johannes.berg@xxxxxxxxx>
Cc: Miri Korenblit <miriam.rachel.korenblit@xxxxxxxxx>
Cc: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Cc: Cryolitia PukNgae <cryolitia@xxxxxxxxxxxxx>
Cc: Jiaming Zhang <r772577952@xxxxxxxxx>
Cc: Will Porter <mrwillporter@xxxxxxxxx>
Cc: Cen Zhang <zzzccc427@xxxxxxxxx>
Cc: "Cássio Gabriel" <cassiogabrielcontato@xxxxxxxxx>
Cc: Rong Zhang <i@xxxxxxxx>
Cc: Arun Raghavan <arunr@xxxxxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: loongarch@xxxxxxxxxxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: linux-parisc@xxxxxxxxxxxxxxx
Cc: linux-edac@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: intel-xe@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-input@xxxxxxxxxxxxxxx
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: intel-wired-lan@xxxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-wireless@xxxxxxxxxxxxxxx
Cc: brcm80211@xxxxxxxxxxxxxxx
Cc: brcm80211-dev-list.pdl@xxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
Cc: linux-gpio@xxxxxxxxxxxxxxx
Cc: linux-scsi@xxxxxxxxxxxxxxx
Cc: linux-nfs@xxxxxxxxxxxxxxx
Cc: devel@xxxxxxxxxxxxxxxxxx
Cc: linux-hardening@xxxxxxxxxxxxxxx
Cc: linux-sound@xxxxxxxxxxxxxxx
---
net/devlink/dev.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/devlink/dev.c b/net/devlink/dev.c
index 55959b0ff5ab..987b071345c4 100644
--- a/net/devlink/dev.c
+++ b/net/devlink/dev.c
@@ -5,6 +5,7 @@
*/
#include <linux/device.h>
+#include <linux/seq_buf.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include "devl_internal.h"
@@ -1190,6 +1191,7 @@ static void __devlink_compat_running_version(struct devlink *devlink,
{
struct devlink_info_req req = {};
const struct nlattr *nlattr;
+ struct seq_buf s;
struct sk_buff *msg;
int rem, err;
@@ -1202,6 +1204,9 @@ static void __devlink_compat_running_version(struct devlink *devlink,
if (err)
goto free_msg;
+ seq_buf_init(&s, buf, len);
+ s.len = strnlen(buf, len);
+
nla_for_each_attr_type(nlattr, DEVLINK_ATTR_INFO_VERSION_RUNNING,
(void *)msg->data, msg->len, rem) {
const struct nlattr *kv;
@@ -1209,8 +1214,7 @@ static void __devlink_compat_running_version(struct devlink *devlink,
nla_for_each_nested_type(kv, DEVLINK_ATTR_INFO_VERSION_VALUE,
nlattr, rem_kv) {
- strlcat(buf, nla_data(kv), len);
- strlcat(buf, " ", len);
+ seq_buf_printf(&s, "%s ", (const char *)nla_data(kv));
}
}
free_msg:
--
2.55.0.1032.g73a4cd73de-goog