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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42f7d331a4fsm23321131f8f.33.2025.12.07.09.54.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 07 Dec 2025 09:54:44 -0800 (PST) Date: Sun, 7 Dec 2025 17:54:42 +0000 From: David Laight To: Syed Tayyab Farooq Cc: netdev@vger.kernel.org, syzbot+0e665e4b99cb925286a0@syzkaller.appspotmail.com, Syed Tayyab Farooq Subject: Re: [PATCH] memset skb to zero to avoid uninit value error from KMSAN Message-ID: <20251207175442.7d5ea387@pumpkin> In-Reply-To: <20251207162109.113159-1-tayyabfarooq1997@outlook.com> References: <20251207162109.113159-1-tayyabfarooq1997@outlook.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 8 Dec 2025 00:20:52 +0800 Syed Tayyab Farooq wrote: > Signed-off-by: Syed Tayyab Farooq > --- > > Hi syzbot, > > Please test this patch. > > #syz test: https://syzkaller.appspot.com/bug?extid=0e665e4b99cb925286a0 > > Thanks, > Tayyab > > > net/phonet/af_phonet.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c > index a27efa4faa4e..9279decd680b 100644 > --- a/net/phonet/af_phonet.c > +++ b/net/phonet/af_phonet.c > @@ -208,6 +208,8 @@ static int pn_raw_send(const void *data, int len, struct net_device *dev, > if (skb == NULL) > return -ENOMEM; > > + memset(skb, 0, MAX_PHONET_HEADER + len); That looks entirely broken. Did you try running it? David > + > if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0) > skb->pkt_type = PACKET_LOOPBACK; >