From: Brian Starkey <brian.starkey@arm.com>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH i-g-t v2 4/5] lib/igt_kms: Fix memory corruption when there's no cursor plane
Date: Mon, 20 Feb 2017 11:02:47 +0000 [thread overview]
Message-ID: <1487588568-5033-4-git-send-email-brian.starkey@arm.com> (raw)
In-Reply-To: <1487588568-5033-1-git-send-email-brian.starkey@arm.com>
The dynamic plane support means that if there's no cursor plane, then
there is no space in the pipe->planes array for it, and thus assigning
a "drm_plane-less" plane is out-of-bounds and leads to heap corruption
and later crashes.
The "drm_plane-less" cursor plane isn't included in n_planes anyway,
which means there's no way to ever access it/know that it's there - so
just remove it entirely.
Fixes: 36656239ef96 lib/igt_kms: Implement dynamic plane count support
Signed-off-by: Brian Starkey <brian.starkey@arm.com>
Reviewed-by: Robert Foss <robert.foss@collabora.com>
---
lib/igt_kms.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 2073a6acfa7b..60c4c260bf2d 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1692,12 +1692,6 @@ void igt_display_init(igt_display_t *display, int drm_fd)
memset(&pipe->planes[last_plane], 0,
sizeof *plane);
}
- } else {
- /* Add drm_plane-less cursor */
- plane = &pipe->planes[p];
- plane->pipe = pipe;
- plane->index = p;
- plane->type = DRM_PLANE_TYPE_CURSOR;
}
pipe->n_planes = n_planes;
--
1.7.9.5
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next prev parent reply other threads:[~2017-02-20 11:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-20 11:02 [PATCH i-g-t v2 1/5] lib/igt_kms: Fix drm_plane leak Brian Starkey
2017-02-20 11:02 ` [PATCH i-g-t v2 2/5] lib/igt_kms: Neaten up pipe->planes[] assignment Brian Starkey
2017-02-20 11:02 ` [PATCH i-g-t v2 3/5] lib/igt_kms: Fix possible out-of-bounds access Brian Starkey
2017-02-20 11:02 ` Brian Starkey [this message]
2017-02-20 11:02 ` [PATCH i-g-t v2 5/5] lib/igt_kms: Remove redundant cursor code Brian Starkey
2017-02-21 10:12 ` [PATCH i-g-t v2 1/5] lib/igt_kms: Fix drm_plane leak Brian Starkey
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