linux-kernel - [PATCH 4.16 064/161] scsi: sg: allocate with __GFP_ZERO in sg_build

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Date:   Thu, 24 May 2018 11:38:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+7d26fc1eea198488deab@...kaller.appspotmail.com,
        Alexander Potapenko <glider@...gle.com>,
        Douglas Gilbert <dgilbert@...erlog.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.16 064/161] scsi: sg: allocate with __GFP_ZERO in sg_build_indirect()

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Potapenko <glider@...gle.com>

commit a45b599ad808c3c982fdcdc12b0b8611c2f92824 upstream.

This shall help avoid copying uninitialized memory to the userspace when
calling ioctl(fd, SG_IO) with an empty command.

Reported-by: syzbot+7d26fc1eea198488deab@...kaller.appspotmail.com
Cc: stable@...r.kernel.org
Signed-off-by: Alexander Potapenko <glider@...gle.com>
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/sg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1894,7 +1894,7 @@ retry:
 		num = (rem_sz > scatter_elem_sz_prev) ?
 			scatter_elem_sz_prev : rem_sz;

-		schp->pages[k] = alloc_pages(gfp_mask, order);
+		schp->pages[k] = alloc_pages(gfp_mask | __GFP_ZERO, order);
 		if (!schp->pages[k])
 			goto out;