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| author | Johannes Thumshirn <jthumshirn@suse.de> | 2017-05-10 09:53:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-31 18:11:32 +0200 |
| commit | 6505dd1f7f55b180439c15d788bc5dea244a4781 (patch) | |
| tree | 035704e677ab871b4ea74b432ccecd41c2085357 /drivers/scsi/sg.c | |
| parent | c44cfe06dfe2a5f54527e87a48c92a6595d070cc (diff) | |
| download | linux-rt-6505dd1f7f55b180439c15d788bc5dea244a4781.tar.gz | |
scsi: sg: don't return bogus Sg_requests
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@suse.de>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Doug Gilbert <dgilbert@interlog.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Doug Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi/sg.c')
| -rw-r--r-- | drivers/scsi/sg.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 7592ac8514d2..f61b37109e5c 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -2064,11 +2064,12 @@ 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 */ |