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[2a03:2880:30ff::face:b00c]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c8e05eb7f0sm4137427a12.72.2024.10.08.02.43.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2024 02:43:40 -0700 (PDT) From: Breno Leitao To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Matthew Wood Cc: kernel-team@meta.com, Simon Horman , netdev@vger.kernel.org (open list:NETWORKING DRIVERS), linux-kernel@vger.kernel.org (open list) Subject: [PATCH net] net: netconsole: fix wrong warning Date: Tue, 8 Oct 2024 02:43:24 -0700 Message-ID: <20241008094325.896208-1-leitao@debian.org> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A warning is triggered when there is insufficient space in the buffer for userdata. However, this is not an issue since userdata will be sent in the next iteration. Current warning message: ------------[ cut here ]------------ WARNING: CPU: 13 PID: 3013042 at drivers/net/netconsole.c:1122 write_e= xt_msg+0x3b6/0x3d0 ? write_ext_msg+0x3b6/0x3d0 console_flush_all+0x1e9/0x330 The code incorrectly issues a warning when this_chunk is zero, which is a valid scenario. The warning should only be triggered when this_chunk is negative. Fixes: 1ec9daf95093 ("net: netconsole: append userdata to fragmented netcon= sole messages") Signed-off-by: Breno Leitao Reviewed-by: Simon Horman --- drivers/net/netconsole.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 01cf33fa7503..de20928f7402 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -1161,8 +1161,14 @@ static void send_ext_msg_udp(struct netconsole_targe= t *nt, const char *msg, =20 this_chunk =3D min(userdata_len - sent_userdata, MAX_PRINT_CHUNK - preceding_bytes); - if (WARN_ON_ONCE(this_chunk <=3D 0)) + if (WARN_ON_ONCE(this_chunk < 0)) + /* this_chunk could be zero if all the previous + * message used all the buffer. This is not a + * problem, userdata will be sent in the next + * iteration + */ return; + memcpy(buf + this_header + this_offset, userdata + sent_userdata, this_chunk); --=20 2.43.5