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Wed, 21 Oct 2026 02:44:01 -0700 (PDT) Received: from gmail.com ([188.253.12.32]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ad8021d29bsm3644438a91.4.2026.10.21.02.43.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 02:44:00 -0700 (PDT) From: Jia Jia To: "Martin K . Petersen" Cc: James Bottomley , Nicholas Bellinger , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/1] scsi: target: validate REGISTER AND MOVE TransportID length Date: Wed, 21 Oct 2026 17:43:34 +0800 Message-Id: <20261021094334.198599-1-physicalmtea@gmail.com> X-Mailer: git-send-email 2.34.1 X-Mailing-List: target-devel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit REGISTER AND MOVE has a 24-byte parameter-list header followed by a TransportID. A 24-byte parameter list with a zero TransportID length passes the existing tid_len + 24 check, then the handler reads buf[24] for the TransportID protocol identifier, one byte past the received parameter list. A TransportID is at least 24 bytes. Reject shorter TransportIDs and compare the declared length with the bytes following the header before reading buf[24]. A malformed PR OUT sent through vhost-scsi triggered this read on a KASAN kernel. The command is now rejected with INVALID PARAMETER LIST before buf[24] is accessed. Fixes: c66ac9db8d4a ("[SCSI] target: Add LIO target core v4.0.0-rc6") Signed-off-by: Jia Jia --- drivers/target/target_core_pr.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index 25b1bcacc0c8..ca1a2802aa22 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -3226,10 +3226,11 @@ core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key, transport_kunmap_data_sg(cmd); buf = NULL; - if ((tid_len + 24) != cmd->data_length) { - pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header" - " does not equal CDB data_length: %u\n", tid_len, - cmd->data_length); + /* TransportID is at least 24 bytes. buf[24] is its first byte. */ + if (tid_len < 24 || + tid_len != cmd->data_length - 24) { + pr_err("SPC-3 PR: Illegal tid_len: %u for data_length: %u\n", + tid_len, cmd->data_length); ret = TCM_INVALID_PARAMETER_LIST; goto out_put_pr_reg; }