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scsi: lpfc: Fix bad memory access during VPD DUMP mailbox command 

The dump command for reading a region passes a requested read length
specified in words (4-byte units). The response overwrites the same field
with the actual number of bytes read.

The mailbox handler for DUMP which reads VPD data (region 23) is treating
the response field as if it were still a word_cnt, thus multiplying it by 4
to set the read's "length". Given the read value was calculated based on
the size of the read buffer, the longer response length runs off the end of
the buffer.

Fix by reworking the code to use the response field as a byte count.

Link: https://lore.kernel.org/r/20210421234511.102206-1-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2021-04-21 16:45:11 -07:00 committed by Martin K. Petersen
parent 83adbba746
commit e4ec10228f
2 changed files with 14 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/scsi/lpfc/lpfc_init.c
View File

@ -254,13 +254,13 @@ lpfc_config_port_prep(struct lpfc_hba *phba)
if (mb->un.varDmp.word_cnt == 0)
break;
i = mb->un.varDmp.word_cnt * sizeof(uint32_t);
if (offset + i > DMP_VPD_SIZE)
i = DMP_VPD_SIZE - offset;
if (mb->un.varDmp.word_cnt > DMP_VPD_SIZE - offset)
mb->un.varDmp.word_cnt = DMP_VPD_SIZE - offset;
lpfc_sli_pcimem_bcopy(((uint8_t *)mb) + DMP_RSP_OFFSET,
lpfc_vpd_data + offset, i);
offset += i;
} while (offset < DMP_VPD_SIZE);
lpfc_vpd_data + offset,
mb->un.varDmp.word_cnt);
offset += mb->un.varDmp.word_cnt;
} while (mb->un.varDmp.word_cnt && offset < DMP_VPD_SIZE);
lpfc_parse_vpd(phba, lpfc_vpd_data, offset);

15
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -19777,7 +19777,7 @@ lpfc_sli_get_config_region23(struct lpfc_hba *phba, char *rgn23_data)
LPFC_MBOXQ_t *pmb = NULL;
MAILBOX_t *mb;
uint32_t offset = 0;
int i, rc;
int rc;
if (!rgn23_data)
return 0;
@ -19808,13 +19808,14 @@ lpfc_sli_get_config_region23(struct lpfc_hba *phba, char *rgn23_data)
if (mb->un.varDmp.word_cnt == 0)
break;
i = mb->un.varDmp.word_cnt * sizeof(uint32_t);
if (offset + i > DMP_RGN23_SIZE)
i = DMP_RGN23_SIZE - offset;
if (mb->un.varDmp.word_cnt > DMP_RGN23_SIZE - offset)
mb->un.varDmp.word_cnt = DMP_RGN23_SIZE - offset;
lpfc_sli_pcimem_bcopy(((uint8_t *)mb) + DMP_RSP_OFFSET,
rgn23_data + offset, i);
offset += i;
} while (offset < DMP_RGN23_SIZE);
rgn23_data + offset,
mb->un.varDmp.word_cnt);
offset += mb->un.varDmp.word_cnt;
} while (mb->un.varDmp.word_cnt && offset < DMP_RGN23_SIZE);
mempool_free(pmb, phba->mbox_mem_pool);
return offset;