diff options
| author | adam radford <aradford@gmail.com> | 2011-10-14 03:01:12 +0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-10-20 19:18:17 +0400 |
| commit | f575c5d3ebdca3b0482847d8fcba971767754a9e (patch) | |
| tree | 8f238a30ea2a4d0a9300466e60a8bae85280fd6d | |
| parent | fba63097b8614a4a158226c02eec0318f41cd24f (diff) | |
| download | linux-f575c5d3ebdca3b0482847d8fcba971767754a9e.tar.xz | |
[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 <aradford@gmail.com>
Cc: stable@kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
| -rw-r--r-- | drivers/scsi/megaraid/megaraid_sas_base.c | 3 |
1 files changed, 1 insertions, 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); |