3.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kees Cook <keesc...@chromium.org>
commit 12176503366885edd542389eed3aaf94be163fdb upstream.
The compat ioctl for VIDEO_SET_SPU_PALETTE was missing an error check
while converting ioctl arguments. This could lead to leaking kernel
stack contents into userspace.
Patch extracted from existing fix in grsecurity.
Signed-off-by: Kees Cook <keesc...@chromium.org>
Cc: David Miller <da...@davemloft.net>
Cc: Brad Spengler <spen...@grsecurity.net>
Cc: PaX Team <pagee...@freemail.hu>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/compat_ioctl.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -210,6 +210,8 @@ static int do_video_set_spu_palette(unsi
err = get_user(palp, &up->palette);
err |= get_user(length, &up->length);
+ if (err)
+ return -EFAULT;
up_native = compat_alloc_user_space(sizeof(struct video_spu_palette));
err = put_user(compat_ptr(palp), &up_native->palette);
--
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