This is a note to let you know that I've just added the patch titled scsi: don't BUG_ON() empty DMA transfers to the 4.4-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-don-t-bug_on-empty-dma-transfers.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From fd3fc0b4d7305fa7246622dcc0dec69c42443f45 Mon Sep 17 00:00:00 2001 From: Johannes Thumshirn <jthumshirn@xxxxxxx> Date: Tue, 31 Jan 2017 10:16:00 +0100 Subject: scsi: don't BUG_ON() empty DMA transfers From: Johannes Thumshirn <jthumshirn@xxxxxxx> commit fd3fc0b4d7305fa7246622dcc0dec69c42443f45 upstream. Don't crash the machine just because of an empty transfer. Use WARN_ON() combined with returning an error. Found by Dmitry Vyukov and syzkaller. [ Changed to "WARN_ON_ONCE()". Al has a patch that should fix the root cause, but a BUG_ON() is not acceptable in any case, and a WARN_ON() might still be a cause of excessive log spamming. NOTE! If this warning ever triggers, we may end up leaking resources, since this doesn't bother to try to clean the command up. So this WARN_ON_ONCE() triggering does imply real problems. But BUG_ON() is much worse. People really need to stop using BUG_ON() for "this shouldn't ever happen". It makes pretty much any bug worse. - Linus ] Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx> Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: James Bottomley <jejb@xxxxxxxxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/scsi/scsi_lib.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1120,7 +1120,8 @@ int scsi_init_io(struct scsi_cmnd *cmd) bool is_mq = (rq->mq_ctx != NULL); int error; - BUG_ON(!rq->nr_phys_segments); + if (WARN_ON_ONCE(!rq->nr_phys_segments)) + return -EINVAL; error = scsi_init_sgtable(rq, &cmd->sdb); if (error) Patches currently in stable-queue which might be from jthumshirn@xxxxxxx are queue-4.4/scsi-don-t-bug_on-empty-dma-transfers.patch