scsi: csiostor: Fix a possible null-pointer dereference in csio_eh_lun_reset_handler()
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Message ID 20190729085135.29403-1-baijiaju1990@gmail.com
State Deferred
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Series
  • scsi: csiostor: Fix a possible null-pointer dereference in csio_eh_lun_reset_handler()
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Commit Message

Jia-Ju Bai July 29, 2019, 8:51 a.m. UTC
In csio_eh_lun_reset_handler(), there is an if statement on line 2072 to
check whether rn is NULL:
    if (!rn)

When rn is NULL, it is used on line 2217:
    CSIO_INC_STATS(rn, n_lun_rst_fail);

Thus, a possible null-pointer dereference may occur.

To fix this bug, csio_eh_lun_reset_handler() directly returns FAILED
when rn is NULL.

This bug is found by a static analysis tool STCheck written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
 drivers/scsi/csiostor/csio_scsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/drivers/scsi/csiostor/csio_scsi.c b/drivers/scsi/csiostor/csio_scsi.c
index 469d0bc9f5fe..c81d743d3544 100644
--- a/drivers/scsi/csiostor/csio_scsi.c
+++ b/drivers/scsi/csiostor/csio_scsi.c
@@ -2070,7 +2070,7 @@  csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
 	struct csio_scsi_level_data sld;
 
 	if (!rn)
-		goto fail;
+		return FAILED;
 
 	csio_dbg(hw, "Request to reset LUN:%llu (ssni:0x%x tgtid:%d)\n",
 		      cmnd->device->lun, rn->flowid, rn->scsi_id);