From: Arun Easi aeasi@marvell.com
commit 00fe717ee1ea3c2979db4f94b1533c57aed8dea9 upstream.
On certain cases when response length is less than 32, NVME response data is supplied inline in IOCB. This is indicated by some combination of state flags. There was an instance when a high, and incorrect, response length was indicated causing driver to overrun buffers. Fix this by checking and limiting the response payload length.
Fixes: 7401bc18d1ee3 ("scsi: qla2xxx: Add FC-NVMe command handling") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20200124045014.23554-1-hmadhani@marvell.com Signed-off-by: Arun Easi aeasi@marvell.com Signed-off-by: Himanshu Madhani hmadhani@marvell.com Reviewed-by: Ewan D. Milne emilne@redhat.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/qla2xxx/qla_dbg.c | 6 ------ drivers/scsi/qla2xxx/qla_dbg.h | 6 ++++++ drivers/scsi/qla2xxx/qla_isr.c | 12 ++++++++++++ 3 files changed, 18 insertions(+), 6 deletions(-)
--- a/drivers/scsi/qla2xxx/qla_dbg.c +++ b/drivers/scsi/qla2xxx/qla_dbg.c @@ -2519,12 +2519,6 @@ qla83xx_fw_dump_failed: /* Driver Debug Functions. */ /****************************************************************************/
-static inline int -ql_mask_match(uint level) -{ - return (level & ql2xextended_error_logging) == level; -} - /* * This function is for formatting and logging debug information. * It is to be used when vha is available. It formats the message --- a/drivers/scsi/qla2xxx/qla_dbg.h +++ b/drivers/scsi/qla2xxx/qla_dbg.h @@ -374,3 +374,9 @@ extern int qla24xx_dump_ram(struct qla_h extern void qla24xx_pause_risc(struct device_reg_24xx __iomem *, struct qla_hw_data *); extern int qla24xx_soft_reset(struct qla_hw_data *); + +static inline int +ql_mask_match(uint level) +{ + return (level & ql2xextended_error_logging) == level; +} --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -1918,6 +1918,18 @@ static void qla24xx_nvme_iocb_entry(scsi inbuf = (uint32_t *)&sts->nvme_ersp_data; outbuf = (uint32_t *)fd->rspaddr; iocb->u.nvme.rsp_pyld_len = le16_to_cpu(sts->nvme_rsp_pyld_len); + if (unlikely(iocb->u.nvme.rsp_pyld_len > + sizeof(struct nvme_fc_ersp_iu))) { + if (ql_mask_match(ql_dbg_io)) { + WARN_ONCE(1, "Unexpected response payload length %u.\n", + iocb->u.nvme.rsp_pyld_len); + ql_log(ql_log_warn, fcport->vha, 0x5100, + "Unexpected response payload length %u.\n", + iocb->u.nvme.rsp_pyld_len); + } + iocb->u.nvme.rsp_pyld_len = + sizeof(struct nvme_fc_ersp_iu); + } iter = iocb->u.nvme.rsp_pyld_len >> 2; for (; iter; iter--) *outbuf++ = swab32(*inbuf++);