linux-kernel - [PATCH AUTOSEL 6.2 01/37] drm/displayid: add displayid_get

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Message-Id: <20230501025945.3253774-1-sashal@kernel.org>
Date:   Sun, 30 Apr 2023 22:59:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jani Nikula <jani.nikula@...el.com>,
        Iaroslav Boliukin <iam@...h.pw>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Sasha Levin <sashal@...nel.org>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.2 01/37] drm/displayid: add displayid_get_header() and check bounds better

From: Jani Nikula <jani.nikula@...el.com>

[ Upstream commit 5bacecc3c56131c31f18b23d366f2184328fd9cf ]

Add a helper to get a pointer to struct displayid_header. To be
pedantic, add buffer overflow checks to not touch the base if that
itself would overflow.

Cc: Iaroslav Boliukin <iam@...h.pw>
Cc: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4a03b3a5132642d3cdb6d4c2641422955a917292.1676580180.git.jani.nikula@intel.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/drm_displayid.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_displayid.c b/drivers/gpu/drm/drm_displayid.c
index 38ea8203df45b..7d03159dc1461 100644
--- a/drivers/gpu/drm/drm_displayid.c
+++ b/drivers/gpu/drm/drm_displayid.c
@@ -7,13 +7,28 @@
 #include <drm/drm_edid.h>
 #include <drm/drm_print.h>
 
+static const struct displayid_header *
+displayid_get_header(const u8 *displayid, int length, int index)
+{
+	const struct displayid_header *base;
+
+	if (sizeof(*base) > length - index)
+		return ERR_PTR(-EINVAL);
+
+	base = (const struct displayid_header *)&displayid[index];
+
+	return base;
+}
+
 static int validate_displayid(const u8 *displayid, int length, int idx)
 {
 	int i, dispid_length;
 	u8 csum = 0;
 	const struct displayid_header *base;
 
-	base = (const struct displayid_header *)&displayid[idx];
+	base = displayid_get_header(displayid, length, idx);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	DRM_DEBUG_KMS("base revision 0x%x, length %d, %d %d\n",
 		      base->rev, base->bytes, base->prod_id, base->ext_count);
-- 
2.39.2