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scsi: lpfc: Fix possible file string name overflow when updating firmware

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Because file_name and phba->ModelName are both declared a size 80 bytes,
the extra ".grp" file extension could cause an overflow into file_name.

Define a ELX_FW_NAME_SIZE macro with value 84.  84 incorporates the 4 extra
characters from ".grp".  file_name is changed to be declared as a char and
initialized to zeros i.e. null chars.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20231031191224.150862-3-justintee8345@gmail.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Justin Tee 2023-10-31 12:12:17 -07:00 committed by Martin K. Petersen
parent 2fe4b6a677
commit f5779b5292
2 changed files with 3 additions and 2 deletions
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1
drivers/scsi/lpfc/lpfc.h
View File

@ -33,6 +33,7 @@
struct lpfc_sli2_slim;
#define ELX_MODEL_NAME_SIZE 80
#define ELX_FW_NAME_SIZE 84
#define LPFC_PCI_DEV_LP 0x1
#define LPFC_PCI_DEV_OC 0x2

4
drivers/scsi/lpfc/lpfc_init.c
View File

@ -14721,7 +14721,7 @@ out:
int
lpfc_sli4_request_firmware_update(struct lpfc_hba *phba, uint8_t fw_upgrade)
{
uint8_t file_name[ELX_MODEL_NAME_SIZE];
char file_name[ELX_FW_NAME_SIZE] = {0};
int ret;
const struct firmware *fw;
@ -14730,7 +14730,7 @@ lpfc_sli4_request_firmware_update(struct lpfc_hba *phba, uint8_t fw_upgrade)
LPFC_SLI_INTF_IF_TYPE_2)
return -EPERM;
snprintf(file_name, ELX_MODEL_NAME_SIZE, "%s.grp", phba->ModelName);
scnprintf(file_name, sizeof(file_name), "%s.grp", phba->ModelName);
if (fw_upgrade == INT_FW_UPGRADE) {
ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT,