This is a note to let you know that I've just added the patch titled
scsi: sg: don't return bogus Sg_requests
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-sg-don-t-return-bogus-sg_requests.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 48ae8484e9fc324b4968d33c585e54bc98e44d61 Mon Sep 17 00:00:00 2001
From: Johannes Thumshirn <jthumshirn@xxxxxxx>
Date: Wed, 10 May 2017 09:53:40 +0200
Subject: scsi: sg: don't return bogus Sg_requests
From: Johannes Thumshirn <jthumshirn@xxxxxxx>
commit 48ae8484e9fc324b4968d33c585e54bc98e44d61 upstream.
If the list search in sg_get_rq_mark() fails to find a valid request, we
return a bogus element. This then can later lead to a GPF in
sg_remove_scat().
So don't return bogus Sg_requests in sg_get_rq_mark() but NULL in case
the list search doesn't find a valid request.
Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Reported-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Doug Gilbert <dgilbert@xxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Acked-by: Doug Gilbert <dgilbert@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/sg.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2074,11 +2074,12 @@ sg_get_rq_mark(Sg_fd * sfp, int pack_id)
if ((1 == resp->done) && (!resp->sg_io_owned) &&
((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
resp->done = 2; /* guard against other readers */
- break;
+ write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
+ return resp;
}
}
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
- return resp;
+ return NULL;
}
/* always adds to end of list */
Patches currently in stable-queue which might be from jthumshirn@xxxxxxx are
queue-4.4/scsi-sg-don-t-return-bogus-sg_requests.patch