This is a note to let you know that I've just added the patch titled
drm/dp: Fix off-by-one in register cache size
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-dp-fix-off-by-one-in-register-cache-size.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@vger.kernel.org> know about it.
>From d4da1f27396fb1dde079447a3612f4f512caed07 Mon Sep 17 00:00:00 2001
From: Kees Cook <keesc...@chromium.org>
Date: Thu, 24 Feb 2022 19:56:09 -0800
Subject: drm/dp: Fix off-by-one in register cache size
From: Kees Cook <keesc...@chromium.org>
commit d4da1f27396fb1dde079447a3612f4f512caed07 upstream.
The pcon_dsc_dpcd array holds 13 registers (0x92 through 0x9E). Fix the
math to calculate the max size. Found from a -Warray-bounds build:
drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_pcon_dsc_bpp_incr':
drivers/gpu/drm/drm_dp_helper.c:3130:28: error: array subscript 12 is outside
array bounds of 'const u8[12]' {aka 'const unsigned char[12]'}
[-Werror=array-bounds]
3130 | buf = pcon_dsc_dpcd[DP_PCON_DSC_BPP_INCR - DP_PCON_DSC_ENCODER];
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/drm_dp_helper.c:3126:39: note: while referencing 'pcon_dsc_dpcd'
3126 | int drm_dp_pcon_dsc_bpp_incr(const u8
pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
|
~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Maxime Ripard <mrip...@kernel.org>
Cc: Thomas Zimmermann <tzimmerm...@suse.de>
Cc: David Airlie <airl...@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Fixes: e2e16da398d9 ("drm/dp_helper: Add support for Configuring DSC for
HDMI2.1 Pcon")
Cc: sta...@vger.kernel.org
Reviewed-by: Gustavo A. R. Silva <gustavo...@kernel.org>
Link: https://lore.kernel.org/lkml/20211214001849.GA62559@embeddedor/
Signed-off-by: Kees Cook <keesc...@chromium.org>
Link: https://lore.kernel.org/r/20220105173310.2420598-1-keesc...@chromium.org
Signed-off-by: Thierry Reding <tred...@nvidia.com>
Link:
https://patchwork.freedesktop.org/patch/msgid/20220225035610.2552144-2-keesc...@chromium.org
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
include/drm/drm_dp_helper.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -455,7 +455,7 @@ struct drm_panel;
# define DP_FEC_BIT_ERROR_COUNT_CAP (1 << 3)
/* DP-HDMI2.1 PCON DSC ENCODER SUPPORT */
-#define DP_PCON_DSC_ENCODER_CAP_SIZE 0xC /* 0x9E - 0x92 */
+#define DP_PCON_DSC_ENCODER_CAP_SIZE 0xD /* 0x92 through 0x9E */
#define DP_PCON_DSC_ENCODER 0x092
# define DP_PCON_DSC_ENCODER_SUPPORTED (1 << 0)
# define DP_PCON_DSC_PPS_ENC_OVERRIDE (1 << 1)
Patches currently in stable-queue which might be from keesc...@chromium.org are
queue-5.15/stack-constrain-and-fix-stack-offset-randomization-w.patch
queue-5.15/coredump-also-dump-first-pages-of-non-executable-elf-libraries.patch
queue-5.15/selftests-lkdtm-add-ubsan-config.patch
queue-5.15/fs-binfmt_elf-fix-at_phdr-for-unusual-elf-files.patch
queue-5.15/gcc-plugins-stackleak-exactly-match-strings-instead-.patch
queue-5.15/exec-force-single-empty-string-when-argv-is-empty.patch
queue-5.15/drm-dp-fix-off-by-one-in-register-cache-size.patch
queue-5.15/pstore-don-t-use-semaphores-in-always-atomic-context-code.patch
