From: Kangjie Lu <kjlu@umn.edu>
To: kjlu@umn.edu
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH] gma/gma500: fix a memory disclosure bug due to uninitialized bytes
Date: Thu, 17 Oct 2019 23:29:53 -0500 [thread overview]
Message-ID: <20191018042953.31099-1-kjlu@umn.edu> (raw)
`best_clock` is an object that may be sent out. Object `clock`
contains uninitialized bytes that are copied to `best_clock`,
which leads to memory disclosure and information leak.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
drivers/gpu/drm/gma500/cdv_intel_display.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/gma500/cdv_intel_display.c b/drivers/gpu/drm/gma500/cdv_intel_display.c
index f56852a503e8..8b784947ed3b 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_display.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_display.c
@@ -405,6 +405,8 @@ static bool cdv_intel_find_dp_pll(const struct gma_limit_t *limit,
struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
struct gma_clock_t clock;
+ memset(&clock, 0, sizeof(clock));
+
switch (refclk) {
case 27000:
if (target < 200000) {
--
2.17.1
next reply other threads:[~2019-10-18 5:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 4:29 Kangjie Lu [this message]
2019-10-22 8:56 ` Daniel Vetter
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