On 13-03-08 05:50 PM, James Bottomley wrote:
On Fri, 2013-03-08 at 12:57 -0500, Douglas Gilbert wrote:
On 13-03-08 07:02 AM, Dan Carpenter wrote:
Static checkers complain that this allocation isn't checked. We
should return zero if the allocation fails.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 1b68142..a022997 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -379,9 +379,12 @@ sas_tlr_supported(struct scsi_device *sdev)
{
const int vpd_len = 32;
struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
- char *buffer = kzalloc(vpd_len, GFP_KERNEL);
+ char *buffer;
int ret = 0;
+ buffer = kzalloc(vpd_len, GFP_KERNEL);
+ if (!buffer)
+ goto out;
if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
goto out;
For 32 bytes, why not use the stack?
Because the buffer is a DMA target. You can't DMA to stack because of
padding and cacheline issues.
And I went to the definition of scsi_get_vpd_page()
to see if that was called out in the header comments.
Guess what ... and those same header comments talked
about freeing a returned pointer. It needs to be
cleaned up, IMO.
Doug Gilbert
/**
* scsi_get_vpd_page - Get Vital Product Data from a SCSI device
* @sdev: The device to ask
* @page: Which Vital Product Data to return
* @buf: where to store the VPD
* @buf_len: number of bytes in the VPD buffer area
*
* SCSI devices may optionally supply Vital Product Data. Each 'page'
* of VPD is defined in the appropriate SCSI document (eg SPC, SBC).
* If the device supports this VPD page, this routine returns a pointer
* to a buffer containing the data from that page. The caller is
* responsible for calling kfree() on this pointer when it is no longer
* needed. If we cannot retrieve the VPD page this routine returns %NULL.
*/
int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf,
int buf_len)
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