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Kees Cook e912d69740 drm/dp: Fix off-by-one in register cache size 
commit d4da1f2739 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 <daniel@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Fixes: e2e16da398 ("drm/dp_helper: Add support for Configuring DSC for HDMI2.1 Pcon")
Cc: stable@vger.kernel.org
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/lkml/20211214001849.GA62559@embeddedor/
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220105173310.2420598-1-keescook@chromium.org
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220225035610.2552144-2-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-08 14:24:04 +02:00
..
acpi ACPICA: actypes.h: Expand the ACPI_ACCESS_ definitions 2022-01-27 11:04:49 +01:00
asm-generic bitops: protect find_first_{,zero}_bit properly 2022-01-27 11:05:34 +01:00
clocksource
crypto
drm drm/dp: Fix off-by-one in register cache size 2022-04-08 14:24:04 +02:00
dt-bindings
keys
kunit kunit: fix kernel-doc warnings due to mismatched arg names 2021-10-06 17:54:07 -06:00
kvm KVM: arm64: Fix PMU probe ordering 2021-09-20 12:43:34 +01:00
linux sched/tracing: Report TASK_RTLOCK_WAIT tasks as TASK_UNINTERRUPTIBLE 2022-04-08 14:23:57 +02:00
math-emu
media media: cec: fix a deadlock situation 2022-01-27 11:02:53 +01:00
memory memory: renesas-rpc-if: Correct QSPI data transfer in Manual mode 2021-11-18 19:16:01 +01:00
misc
net netfilter: conntrack: Add and use nf_ct_set_auto_assign_helper_warned() 2022-04-08 14:23:42 +02:00
pcmcia
ras
rdma RDMA/netlink: Add __maybe_unused to static inline in C file 2021-11-25 09:49:07 +01:00
scsi scsi: core: sd: Add silence_suspend flag to suppress some PM messages 2022-04-08 14:22:54 +02:00
soc net: dsa: tag_ocelot_8021q: break circular dependency with ocelot switch lib 2021-10-12 17:35:18 -07:00
sound ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock 2022-04-08 14:22:55 +02:00
target scsi: target: Fix ordered tag handling 2021-11-25 09:48:29 +01:00
trace ext4: fix ext4_fc_stats trace point 2022-04-08 14:22:58 +02:00
uapi serial: 8250_aspeed_vuart: add PORT_ASPEED_VUART port type 2022-04-08 14:23:45 +02:00
vdso
video
xen xen/gnttab: fix gnttab_end_foreign_access() without page specified 2022-03-11 12:22:37 +01:00