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[PATCH] scsi_dh_emc: fix uninitialized return value ret

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  [PATCH] scsi_dh_emc: fix uninitialized return value ret Colin King <colin.king@canonical.com> - 2017-01-31 13:30 +0100
    Re: [PATCH] scsi_dh_emc: fix uninitialized return value ret walter harms <wharms@bfs.de> - 2017-01-31 13:50 +0100

#1570673 — [PATCH] scsi_dh_emc: fix uninitialized return value ret

From: Colin Ian King <colin.king@canonical.com>

ret is uninitialized on a successful execution of clarrion_std_inquiry
and a garbage return value is being returted.  Fix this by setting ret
to zero on the success exit path.

Found by CoverityScan, CID#1398889 ("Uninitialized scaler variable")

Fixes: b78205c93297b8219 ("scsi_dh_emc: switch to scsi_execute_req_flags()")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/scsi/device_handler/scsi_dh_emc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 4a7679f..6647da2 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -376,6 +376,7 @@ static int clariion_std_inquiry(struct scsi_device *sdev,
 	sdev_printk(KERN_INFO, sdev,
 		    "%s: detected Clariion %s, flags %x\n",
 		    CLARIION_NAME, sp_model, csdev->flags);
+	err = 0;
 out:
 	return err;
 }
-- 
2.10.2

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#1570693

Am 31.01.2017 13:22, schrieb Colin King:
> From: Colin Ian King <colin.king@canonical.com>
> 
> ret is uninitialized on a successful execution of clarrion_std_inquiry
> and a garbage return value is being returted.  Fix this by setting ret
> to zero on the success exit path.
> 
> Found by CoverityScan, CID#1398889 ("Uninitialized scaler variable")
> 
> Fixes: b78205c93297b8219 ("scsi_dh_emc: switch to scsi_execute_req_flags()")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/scsi/device_handler/scsi_dh_emc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
> index 4a7679f..6647da2 100644
> --- a/drivers/scsi/device_handler/scsi_dh_emc.c
> +++ b/drivers/scsi/device_handler/scsi_dh_emc.c
> @@ -376,6 +376,7 @@ static int clariion_std_inquiry(struct scsi_device *sdev,
>  	sdev_printk(KERN_INFO, sdev,
>  		    "%s: detected Clariion %s, flags %x\n",
>  		    CLARIION_NAME, sp_model, csdev->flags);
> +	err = 0;
>  out:
>  	return err;
>  }



I am not sure IMHO err is set in the first line  err = send_inquiry_cmd(sdev, 0, csdev);

but this looks strange:
  if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
IMHO we can drop strlen() and the compare should be agaist:
 #define emc_default_str "FC (Legacy)"

just my 2 cents,

re,
 wh

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