[3.19.y-ckt stable] Patch "drm/qxl: use kmalloc_array to alloc reloc_info in qxl_process_single_command" has been added to the 3.19.y-ckt tree
Kamal Mostafa
kamal at canonical.com
Wed Mar 9 00:25:23 UTC 2016
This is a note to let you know that I have just added a patch titled
drm/qxl: use kmalloc_array to alloc reloc_info in qxl_process_single_command
to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue
This patch is scheduled to be released in version 3.19.8-ckt16.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
---8<------------------------------------------------------------
>From dbb5772c67e881015e115af084f5f686d3e5b1b3 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel at redhat.com>
Date: Tue, 16 Feb 2016 14:25:00 +0100
Subject: drm/qxl: use kmalloc_array to alloc reloc_info in
qxl_process_single_command
commit 34855706c30d52b0a744da44348b5d1cc39fbe51 upstream.
This avoids integer overflows on 32bit machines when calculating
reloc_info size, as reported by Alan Cox.
Cc: gnomes at lxorguk.ukuu.org.uk
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Dave Airlie <airlied at redhat.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
drivers/gpu/drm/qxl/qxl_ioctl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c
index 7354a4c..3aefaa0 100644
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -168,7 +168,8 @@ static int qxl_process_single_command(struct qxl_device *qdev,
cmd->command_size))
return -EFAULT;
- reloc_info = kmalloc(sizeof(struct qxl_reloc_info) * cmd->relocs_num, GFP_KERNEL);
+ reloc_info = kmalloc_array(cmd->relocs_num,
+ sizeof(struct qxl_reloc_info), GFP_KERNEL);
if (!reloc_info)
return -ENOMEM;
--
2.7.0
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