4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Thumshirn <jthumsh...@suse.de>
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 <jthumsh...@suse.de>
Reported-by: Andrey Konovalov <andreyk...@google.com>
Cc: Hannes Reinecke <h...@suse.de>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Doug Gilbert <dgilb...@interlog.com>
Reviewed-by: Hannes Reinecke <h...@suse.de>
Acked-by: Doug Gilbert <dgilb...@interlog.com>
Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>
Cc: Tony Battersby <to...@cybernetics.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
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 */
