6.10-stable review patch. If anyone has any objections, please let me know.
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From: Justin Tee justin.tee@broadcom.com
[ Upstream commit 8bc7c617642db6d8d20ee671fb6c4513017e7a7e ]
On big endian architectures, it is possible to run into a memory out of bounds pointer dereference when FCP targets are zoned.
In lpfc_prep_embed_io, the memcpy(ptr, fcp_cmnd, sgl->sge_len) is referencing a little endian formatted sgl->sge_len value. So, the memcpy can cause big endian systems to crash.
Redefine the *sgl ptr as a struct sli4_sge_le to make it clear that we are referring to a little endian formatted data structure. And, update the routine with proper le32_to_cpu macro usages.
Fixes: af20bb73ac25 ("scsi: lpfc: Add support for 32 byte CDBs") Signed-off-by: Justin Tee justin.tee@broadcom.com Link: https://lore.kernel.org/r/20240628172011.25921-8-justintee8345@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/lpfc/lpfc_sli.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index f475e7ece41a4..3e55d5edd60ab 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -10579,10 +10579,11 @@ lpfc_prep_embed_io(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd) { struct lpfc_iocbq *piocb = &lpfc_cmd->cur_iocbq; union lpfc_wqe128 *wqe = &lpfc_cmd->cur_iocbq.wqe; - struct sli4_sge *sgl; + struct sli4_sge_le *sgl; + u32 type_size;
/* 128 byte wqe support here */ - sgl = (struct sli4_sge *)lpfc_cmd->dma_sgl; + sgl = (struct sli4_sge_le *)lpfc_cmd->dma_sgl;
if (phba->fcp_embed_io) { struct fcp_cmnd *fcp_cmnd; @@ -10591,9 +10592,9 @@ lpfc_prep_embed_io(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd) fcp_cmnd = lpfc_cmd->fcp_cmnd;
/* Word 0-2 - FCP_CMND */ - wqe->generic.bde.tus.f.bdeFlags = - BUFF_TYPE_BDE_IMMED; - wqe->generic.bde.tus.f.bdeSize = sgl->sge_len; + type_size = le32_to_cpu(sgl->sge_len); + type_size |= ULP_BDE64_TYPE_BDE_IMMED; + wqe->generic.bde.tus.w = type_size; wqe->generic.bde.addrHigh = 0; wqe->generic.bde.addrLow = 72; /* Word 18 */
@@ -10602,13 +10603,13 @@ lpfc_prep_embed_io(struct lpfc_hba *phba, struct lpfc_io_buf *lpfc_cmd)
/* Word 18-29 FCP CMND Payload */ ptr = &wqe->words[18]; - memcpy(ptr, fcp_cmnd, sgl->sge_len); + lpfc_sli_pcimem_bcopy(fcp_cmnd, ptr, le32_to_cpu(sgl->sge_len)); } else { /* Word 0-2 - Inline BDE */ wqe->generic.bde.tus.f.bdeFlags = BUFF_TYPE_BDE_64; - wqe->generic.bde.tus.f.bdeSize = sgl->sge_len; - wqe->generic.bde.addrHigh = sgl->addr_hi; - wqe->generic.bde.addrLow = sgl->addr_lo; + wqe->generic.bde.tus.f.bdeSize = le32_to_cpu(sgl->sge_len); + wqe->generic.bde.addrHigh = le32_to_cpu(sgl->addr_hi); + wqe->generic.bde.addrLow = le32_to_cpu(sgl->addr_lo);
/* Word 10 */ bf_set(wqe_dbde, &wqe->generic.wqe_com, 1);