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| author | Justin Tee <justin.tee@broadcom.com> | 2024-06-28 20:20:10 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2024-07-05 06:24:52 +0300 |
| commit | 8bc7c617642db6d8d20ee671fb6c4513017e7a7e (patch) | |
| tree | 466dc4f462dc5c61f441142389c044d1e2cc8556 /drivers/scsi | |
| parent | f65f31ac120bd2c308bf16b18e5ee74445c06446 (diff) | |
| download | linux-8bc7c617642db6d8d20ee671fb6c4513017e7a7e.tar.xz | |
scsi: lpfc: Revise lpfc_prep_embed_io routine with proper endian macro usages
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>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_sli.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 8bfac9143314..88debef2fb6d 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); |