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[34.83.123.78]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39e6cb0190bsm6166605a91.13.2026.09.19.15.26.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Sep 2026 15:26:26 -0700 (PDT) From: Hui Peng To: dlemoal@kernel.org, cassel@kernel.org Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ata: libata-scsi: reject multi-sector taskfile commands when dev->multi_count is 0 Date: Sat, 19 Sep 2026 22:26:25 +0000 Message-ID: <20260919222625.3797581-1-benquike@gmail.com> X-Mailer: git-send-email 2.55.0.1082.g2b9226bbc0-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In ata_scsi_pass_thru() (drivers/ata/libata-scsi.c), issuing ATA_CMD_READ_MULTI / ATA_CMD_WRITE_MULTI / ATA_CMD_READ_MULTI_EXT / ATA_CMD_WRITE_MULTI_EXT / ATA_CMD_WRITE_MULTI_FUA_EXT via SG_IO when dev->multi_count == 0 sets qc->sect_size = 0 and triggers a divide-by- zero or WARN_ON in the ATA PIO/taskfile path. Reject ATA_PROT_PIO multi- sector commands with -EINVAL when dev->multi_count == 0. Fixes: c6fd280766a0 ("Move libata to drivers/ata.") Assisted-by: LLM Signed-off-by: Hui Peng --- diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index b3666519b648..c99f2845d09b 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -3507,6 +3507,11 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) if (is_multi_taskfile(tf)) { unsigned int multi_count = 1 << (cdb[1] >> 5); + if (!dev->multi_count) { + fp = (cdb[0] == ATA_16) ? 14 : 9; + goto invalid_fld; + } + /* compare the passed through multi_count * with the cached multi_count of libata */