[lvc-project] [PATCH 5.10] drm/dp: Fix OOB read when handling Post Cursor2 register

[Alexey V. Vissarionov]

From: Kees Cook <kees at kernel.org>

commit a2151490cc6c57b368d7974ffd447a8b36ade639 upstream.

The link_status array was not large enough to read the Adjust Request
Post Cursor2 register, so remove the common helper function to avoid
an OOB read, found with a -Warray-bounds build:

drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_get_adjust_request_post
drivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside
   59 |         return link_status[r - DP_LANE0_1_STATUS];
      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status
  147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LIN
      |                                          ~~~~~~~~~^~~~~~~~~~~~~~~~~~

Replace the only user of the helper with an open-coded fetch and decode,
similar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c.

Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Maxime Ripard <mripard at kernel.org>
Cc: Thomas Zimmermann <tzimmermann at suse.de>
Cc: David Airlie <airlied at linux.ie>
Cc: dri-devel at lists.freedesktop.org
Fixes: 79465e0ffeb9 ("drm/dp: Add helper to get post-cursor adjustments")
Signed-off-by: Kees Cook <keescook at chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars at kernel.org>
Reviewed-by: Jani Nikula <jani.nikula at intel.com>
Link: https://lore.kernel.org/r/20220105173507.2420910-1-keescook@chromium.o
Signed-off-by: Thierry Reding <treding at nvidia.com>
Signed-off-by: Alexey V. Vissarionov <gremlin at altlinux.org>
---
 drivers/gpu/drm/drm_dp_helper.c | 10 ----------
 drivers/gpu/drm/tegra/dp.c      | 11 ++++++++++-
 include/drm/drm_dp_helper.h     |  2 --
 3 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 6ba16db7750031b9..0192b5736b31f312 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -122,16 +122,6 @@ u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SI
 }
 EXPORT_SYMBOL(drm_dp_get_adjust_request_pre_emphasis);
 
-u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE],
-					 unsigned int lane)
-{
-	unsigned int offset = DP_ADJUST_REQUEST_POST_CURSOR2;
-	u8 value = dp_link_status(link_status, offset);
-
-	return (value >> (lane << 1)) & 0x3;
-}
-EXPORT_SYMBOL(drm_dp_get_adjust_request_post_cursor);
-
 void drm_dp_link_train_clock_recovery_delay(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
 {
 	unsigned long rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] &
diff --git a/drivers/gpu/drm/tegra/dp.c b/drivers/gpu/drm/tegra/dp.c
index 70dfb7d1dec55a53..f5535eb04c6b1df2 100644
--- a/drivers/gpu/drm/tegra/dp.c
+++ b/drivers/gpu/drm/tegra/dp.c
@@ -549,6 +549,15 @@ static void drm_dp_link_get_adjustments(struct drm_dp_link *link,
 {
 	struct drm_dp_link_train_set *adjust = &link->train.adjust;
 	unsigned int i;
+	u8 post_cursor;
+	int err;
+
+	err = drm_dp_dpcd_read(link->aux, DP_ADJUST_REQUEST_POST_CURSOR2,
+			       &post_cursor, sizeof(post_cursor));
+	if (err < 0) {
+		DRM_ERROR("failed to read post_cursor2: %d\n", err);
+		post_cursor = 0;
+	}
 
 	for (i = 0; i < link->lanes; i++) {
 		adjust->voltage_swing[i] =
@@ -560,7 +569,7 @@ static void drm_dp_link_get_adjustments(struct drm_dp_link *link,
 				DP_TRAIN_PRE_EMPHASIS_SHIFT;
 
 		adjust->post_cursor[i] =
-			drm_dp_get_adjust_request_post_cursor(status, i);
+			(post_cursor >> (i << 1)) & 0x3;
 	}
 }
 
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 881d329cee2f00e3..74335128e3de7128 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1177,8 +1177,6 @@ u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
 				     int lane);
 u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE],
 					  int lane);
-u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE],
-					 unsigned int lane);
 
 #define DP_BRANCH_OUI_HEADER_SIZE	0xc
 #define DP_RECEIVER_CAP_SIZE		0xf

-- 
Alexey V. Vissarionov
gremlin ПРИ altlinux ТЧК org; +vii-cmiii-ccxxix-lxxix-xlii
GPG: 0D92F19E1C0DC36E27F61A29CD17E2B43D879005 @ hkp://keys.gnupg.net