linux-kernel - [PATCH 4/8] staging: dream: fix information leak to userland

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Date:	Fri, 29 Oct 2010 00:01:51 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, Tejun Heo <tj@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] staging: dream: fix information leak to userland

Structure msm_audio_stats is copied to userland with some fields unitialized.
It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 drivers/staging/dream/qdsp5/audio_in.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/dream/qdsp5/audio_in.c b/drivers/staging/dream/qdsp5/audio_in.c
index b51fa09..a14f7ce 100644
--- a/drivers/staging/dream/qdsp5/audio_in.c
+++ b/drivers/staging/dream/qdsp5/audio_in.c
@@ -612,6 +612,7 @@ static long audio_in_ioctl(struct file *file,
 
 	if (cmd == AUDIO_GET_STATS) {
 		struct msm_audio_stats stats;
+		memset(&stats, 0, sizeof(stats));
 		stats.byte_count = atomic_read(&audio->in_bytes);
 		if (copy_to_user((void *) arg, &stats, sizeof(stats)))
 			return -EFAULT;
-- 
1.7.0.4

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