linux-kernel - [34-longterm 104/260] i915: return -EFAULT if copy_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun,  2 Jan 2011 02:16:40 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Dan Carpenter <error27@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 104/260] i915: return -EFAULT if copy_to_user fails

From: Dan Carpenter <error27@...il.com>

commit 9927a403ca8c97798129953fa9cbb5dc259c7cb9 upstream.

copy_to_user returns the number of bytes remaining to be copied, but we
want to return a negative error code here.  These are returned to
userspace.

Signed-off-by: Dan Carpenter <error27@...il.com>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/gpu/drm/i915/i915_dma.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 9550230..b0ac371 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -691,8 +691,10 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
 		ret = copy_from_user(cliprects, batch->cliprects,
 				     batch->num_cliprects *
 				     sizeof(struct drm_clip_rect));
-		if (ret != 0)
+		if (ret != 0) {
+			ret = -EFAULT;
 			goto fail_free;
+		}
 	}
 
 	mutex_lock(&dev->struct_mutex);
@@ -733,8 +735,10 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
 		return -ENOMEM;
 
 	ret = copy_from_user(batch_data, cmdbuf->buf, cmdbuf->sz);
-	if (ret != 0)
+	if (ret != 0) {
+		ret = -EFAULT;
 		goto fail_batch_free;
+	}
 
 	if (cmdbuf->num_cliprects) {
 		cliprects = kcalloc(cmdbuf->num_cliprects,
@@ -747,8 +751,10 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
 		ret = copy_from_user(cliprects, cmdbuf->cliprects,
 				     cmdbuf->num_cliprects *
 				     sizeof(struct drm_clip_rect));
-		if (ret != 0)
+		if (ret != 0) {
+			ret = -EFAULT;
 			goto fail_clip_free;
+		}
 	}
 
 	mutex_lock(&dev->struct_mutex);
-- 
1.7.3.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/