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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Sabrina Dubroca , Arun Ramadoss , UNGLinuxDriver@microchip.com, Michael Ellerman , Doruk Tan Ozturk Subject: [PATCH net 0/3] net: don't read an unset MAC header on the raw/qdisc-bypass TX path Date: Mon, 13 Jul 2026 21:40:07 +0200 Message-ID: <20260713194010.54642-1-doruk@0sec.ai> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On the AF_PACKET SOCK_RAW + PACKET_QDISC_BYPASS transmit path, skb->mac_header is left unset when ndo_start_xmit() runs, so eth_hdr(skb) resolves ~64KB out of bounds. Commit f5089008f90c ("macsec: don't read an unset MAC header in macsec_encrypt()") fixed one instance; these three are the same class in other TX/.xmit paths, each reading eth_hdr(skb)->h_dest. On TX the L2 header is at skb->data, so use skb_eth_hdr() (a no-op on normal TX where mac_header is set). Found by static analysis (0sec); verified against source, not runtime-reproduced. Confirmed by an independent cross-check that mac_header is unset on the bypass path (__dev_direct_xmit does not reset it). More siblings exist (sja1105 shared TX/RX helper, atlantic PTP path) and will follow separately. Doruk Tan Ozturk (3): net: dsa: tag_ocelot_8021q: don't read an unset MAC header on transmit net: dsa: tag_ksz: don't read an unset MAC header in lan937x_xmit() ibmveth: don't read an unset MAC header on transmit drivers/net/ethernet/ibm/ibmveth.c | 2 +- net/dsa/tag_ksz.c | 2 +- net/dsa/tag_ocelot_8021q.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) -- 2.43.0