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From: Dan Carpenter <dan.carpenter@oracle.com>
To: David Airlie <airlied@linux.ie>
Cc: security@kernel.org, "Marek Olšák" <marek.olsak@amd.com>,
	"Ilja Van Sprundel" <ivansprundel@ioactive.com>,
	dri-devel@lists.freedesktop.org,
	"Alex Deucher" <alexander.deucher@amd.com>,
	"Leo Liu" <leo.liu@amd.com>,
	"Christian König" <christian.koenig@amd.com>,
	"monk.liu" <monk.liu@amd.com>
Subject: [patch 4/4] drm/amdgpu: integer overflow in amdgpu_mode_dumb_create()
Date: Wed, 23 Sep 2015 14:00:59 +0300	[thread overview]
Message-ID: <20150923110059.GD16158@mwanda> (raw)
In-Reply-To: <13E61BCA7787794E89BDF39B8DE40C024D12E9F63F@ioaexchange.ioactive.local>

args->size is a u64.  arg->pitch and args->height are u32.  The
multiplication will overflow instead of using the high 32 bits as
intended.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index dac14de..2023055 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -656,7 +656,7 @@ int amdgpu_mode_dumb_create(struct drm_file *file_priv,
 	int r;
 
 	args->pitch = amdgpu_align_pitch(adev, args->width, args->bpp, 0) * ((args->bpp + 1) / 8);
-	args->size = args->pitch * args->height;
+	args->size = (u64)args->pitch * args->height;
 	args->size = ALIGN(args->size, PAGE_SIZE);
 
 	r = amdgpu_gem_object_create(adev, args->size, 0,
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      parent reply	other threads:[~2015-09-23 11:01 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <13E61BCA7787794E89BDF39B8DE40C024D12E9F63F@ioaexchange.ioactive.local>
2015-09-23 10:59 ` [patch 1/4] drm/amdgpu: unwind properly in amdgpu_cs_parser_init() Dan Carpenter
2015-09-23 14:16   ` Christian König
2015-09-23 17:13     ` Alex Deucher
2015-09-24  7:56       ` Dan Carpenter
2015-09-24 12:56         ` Deucher, Alexander
2015-09-25 11:36           ` [patch] drm/amdgpu: signedness bug " Dan Carpenter
2015-09-25 11:36             ` Dan Carpenter
2015-09-29 17:44             ` Alex Deucher
2015-09-29 17:44               ` Alex Deucher
2015-09-23 11:00 ` [patch 2/4] drm/amdgpu: integer overflow in amdgpu_info_ioctl() Dan Carpenter
2015-09-23 11:00 ` [patch 3/4] drm/amdgpu: info leak in amdgpu_gem_metadata_ioctl() Dan Carpenter
2015-09-23 11:00 ` Dan Carpenter [this message]

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