From 6022f210461fef67e6e676fd8544ca02d1bcfa7a Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 9 Sep 2022 08:54:47 +0200 Subject: scsi: stex: Properly zero out the passthrough command structure The passthrough structure is declared off of the stack, so it needs to be set to zero before copied back to userspace to prevent any unintentional data leakage. Switch things to be statically allocated which will fill the unused fields with 0 automatically. Link: https://lore.kernel.org/r/YxrjN3OOw2HHl9tx@kroah.com Cc: stable@kernel.org Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: Dan Carpenter Reported-by: hdthky Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman Signed-off-by: Martin K. Petersen --- drivers/scsi/stex.c | 17 +++++++++-------- include/scsi/scsi_cmnd.h | 2 +- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c index e6420f2127ce..8def242675ef 100644 --- a/drivers/scsi/stex.c +++ b/drivers/scsi/stex.c @@ -665,16 +665,17 @@ static int stex_queuecommand_lck(struct scsi_cmnd *cmd) return 0; case PASSTHRU_CMD: if (cmd->cmnd[1] == PASSTHRU_GET_DRVVER) { - struct st_drvver ver; + const struct st_drvver ver = { + .major = ST_VER_MAJOR, + .minor = ST_VER_MINOR, + .oem = ST_OEM, + .build = ST_BUILD_VER, + .signature[0] = PASSTHRU_SIGNATURE, + .console_id = host->max_id - 1, + .host_no = hba->host->host_no, + }; size_t cp_len = sizeof(ver); - ver.major = ST_VER_MAJOR; - ver.minor = ST_VER_MINOR; - ver.oem = ST_OEM; - ver.build = ST_BUILD_VER; - ver.signature[0] = PASSTHRU_SIGNATURE; - ver.console_id = host->max_id - 1; - ver.host_no = hba->host->host_no; cp_len = scsi_sg_copy_from_buffer(cmd, &ver, cp_len); if (sizeof(ver) == cp_len) cmd->result = DID_OK << 16; diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index bac55decf900..7d3622db38ed 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -201,7 +201,7 @@ static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd) for_each_sg(scsi_sglist(cmd), sg, nseg, __i) static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, - void *buf, int buflen) + const void *buf, int buflen) { return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, buflen); -- cgit v1.2.3-70-g09d2