This is a note to let you know that I've just added the patch titled scsi: sg: fix static checker warning in sg_is_valid_dxfer to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: scsi-sg-fix-static-checker-warning-in-sg_is_valid_dxfer.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 14074aba4bcda3764c9a702b276308b89901d5b6 Mon Sep 17 00:00:00 2001 From: Johannes Thumshirn <jthumshirn@xxxxxxx> Date: Mon, 17 Jul 2017 15:11:42 +0200 Subject: scsi: sg: fix static checker warning in sg_is_valid_dxfer From: Johannes Thumshirn <jthumshirn@xxxxxxx> 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 <jthumshirn@xxxxxxx> Reported-by: Colin Ian King <colin.king@xxxxxxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/scsi/sg.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -759,8 +759,11 @@ 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: Patches currently in stable-queue which might be from jthumshirn@xxxxxxx are queue-4.9/scsi-sg-fix-static-checker-warning-in-sg_is_valid_dxfer.patch queue-4.9/scsi-sg-only-check-for-dxfer_len-greater-than-256m.patch queue-4.9/scsi-sg-check-for-valid-direction-before-starting-the-request.patch queue-4.9/scsi-sg-close-race-condition-in-sg_remove_sfp_usercontext.patch queue-4.9/scsi-sg-fix-sg_dxfer_from_dev-transfers.patch queue-4.9/scsi-core-scsi_get_device_flags_keyed-always-return-device-flags.patch