3.16.85-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Thumshirn <jthumsh...@suse.de>
commit 14074aba4bcda3764c9a702b276308b89901d5b6 upstream.
dxfer_len is an unsigned int and we always assign a value > 0 to it, so
it doesn't make any sense to check if it is < 0. We can't really check
dxferp as well as we have both NULL and not NULL cases in the possible
call paths.
So just return true for SG_DXFER_FROM_DEV transfer in
sg_is_valid_dxfer().
Signed-off-by: Johannes Thumshirn <jthumsh...@suse.de>
Reported-by: Colin Ian King <colin.k...@canonical.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Cc: Douglas Gilbert <dgilb...@interlog.com>
Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
drivers/scsi/sg.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -796,8 +796,11 @@ static bool sg_is_valid_dxfer(sg_io_hdr_
return false;
return true;
case SG_DXFER_FROM_DEV:
- if (hp->dxfer_len < 0)
- return false;
+ /*
+ * for SG_DXFER_FROM_DEV we always set dxfer_len to > 0. dxferp
+ * can either be NULL or != NULL so there's no point in checking
+ * it either. So just return true.
+ */
return true;
case SG_DXFER_TO_DEV:
case SG_DXFER_TO_FROM_DEV:
