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([2405:201:c052:b00b:9a9f:f6f8:5800:36c0]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-315bebee8d0sm38776661eec.24.2026.08.10.01.34.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Aug 2026 01:34:18 -0700 (PDT) From: pavankumaryalagada@gmail.com To: anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com Cc: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, syzbot+e0abb1d45ac291ebebeb@syzkaller.appspotmail.com, Yalagada Pavan Kumar Subject: [PATCH v2] e100: prevent shift-out-of-bounds in e100_eeprom_load() Date: Mon, 10 Aug 2026 14:03:55 +0530 Message-ID: <20260810083355.21631-1-pavankumaryalagada@gmail.com> X-Mailer: git-send-email 2.43.0 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" From: Yalagada Pavan Kumar When reading the EEPROM address length, e100_eeprom_read() can return an invalid length (0 or >=3D 16). Passing an invalid addr_len to bit-shift operations causes a shift out-of-bounds, triggering a kernel panic or UBSAN warning. Validate addr_len after reading it from EEPROM in both e100_eeprom_load() and e100_eeprom_save(), and return -EIO if the value is out of bounds. Reported-by: syzbot+e0abb1d45ac291ebebeb@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3De0abb1d45ac291ebebeb Signed-off-by: Yalagada Pavan Kumar --- Tested in QEMU using syzbot c reproducer. v2: - Return -EIO instead of -EINVAL for an invalid EEPROM address length. - Validate addr_len in e100_eeprom_save() as well. - Drop the unnecessary 1U change in the shift. - Update the commit message. v1: https://lore.kernel.org/all/20260807145626.52692-1-pavankumaryalagada@gmail= .com/T/ --- drivers/net/ethernet/intel/e100.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel= /e100.c index 1de5cd41ea0c..464dc2d6cdb5 100644 --- a/drivers/net/ethernet/intel/e100.c +++ b/drivers/net/ethernet/intel/e100.c @@ -775,10 +775,10 @@ static int e100_eeprom_load(struct nic *nic) netif_err(nic, probe, nic->netdev, "Invalid EEPROM address length %u\n", addr_len); - return -EINVAL; + return -EIO; } =20 - nic->eeprom_wc =3D 1U << addr_len; + nic->eeprom_wc =3D 1 << addr_len; =20 for (addr =3D 0; addr < nic->eeprom_wc; addr++) { nic->eeprom[addr] =3D e100_eeprom_read(nic, &addr_len, addr); @@ -804,6 +804,14 @@ static int e100_eeprom_save(struct nic *nic, u16 start= , u16 count) =20 /* Try reading with an 8-bit addr len to discover actual addr len */ e100_eeprom_read(nic, &addr_len, 0); + + if (!addr_len || addr_len >=3D 16) { + netif_err(nic, probe, nic->netdev, + "Invalid EEPROM address length %u\n", + addr_len); + return -EIO; + } + nic->eeprom_wc =3D 1 << addr_len; =20 if (start + count >=3D nic->eeprom_wc) --=20 2.43.0