From f575c5d3ebdca3b0482847d8fcba971767754a9e Mon Sep 17 00:00:00 2001 From: adam radford Date: Thu, 13 Oct 2011 16:01:12 -0700 Subject: [PATCH] [SCSI] megaraid_sas: Fix instance access in megasas_reset_timer The following patch for megaraid_sas will fix a potential bad pointer access in megasas_reset_timer(), when a MegaRAID 9265/9285 or 9360/9380 gets a timeout. megasas_build_io_fusion() sets SCp.ptr to be a struct megasas_cmd_fusion *, but then megasas_reset_timer() was casting SCp.ptr to be a struct megasas_cmd *, then trying to access cmd->instance, which is invalid. Just loading instance from scmd->device->host->hostdata in megasas_reset_timer() fixes the issue. Signed-off-by: Adam Radford Cc: stable@kernel.org Signed-off-by: James Bottomley --- drivers/scsi/megaraid/megaraid_sas_base.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 8d587cb73cb7..29a994f9c4f1 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -1914,7 +1914,6 @@ static int megasas_generic_reset(struct scsi_cmnd *scmd) static enum blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd) { - struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr; struct megasas_instance *instance; unsigned long flags; @@ -1923,7 +1922,7 @@ blk_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd) return BLK_EH_NOT_HANDLED; } - instance = cmd->instance; + instance = (struct megasas_instance *)scmd->device->host->hostdata; if (!(instance->flag & MEGASAS_FW_BUSY)) { /* FW is busy, throttle IO */ spin_lock_irqsave(instance->host->host_lock, flags); -- 2.20.1