Greg Kroah-Hartman
2023-Mar-07 16:50 UTC
[Nouveau] [PATCH 6.2 0228/1001] drm/nouveau/disp: Fix nvif_outp_acquire_dp() argument size
From: Kees Cook <keescook at chromium.org>
[ Upstream commit 4076ea2419cf15bc1e1580f8b24ddf675fbdb02c ]
Both Coverity and GCC with -Wstringop-overflow noticed that
nvif_outp_acquire_dp() accidentally defined its second argument with 1
additional element:
drivers/gpu/drm/nouveau/dispnv50/disp.c: In function
'nv50_pior_atomic_enable':
drivers/gpu/drm/nouveau/dispnv50/disp.c:1813:17: error:
'nvif_outp_acquire_dp' accessing 16 bytes in a region of size 15
[-Werror=stringop-overflow=]
1813 | nvif_outp_acquire_dp(&nv_encoder->outp,
nv_encoder->dp.dpcd, 0, 0, false, false);
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/nouveau/dispnv50/disp.c:1813:17: note: referencing argument 2 of
type 'u8[16]' {aka 'unsigned char[16]'}
drivers/gpu/drm/nouveau/include/nvif/outp.h:24:5: note: in a call to function
'nvif_outp_acquire_dp'
24 | int nvif_outp_acquire_dp(struct nvif_outp *, u8 dpcd[16],
| ^~~~~~~~~~~~~~~~~~~~
Avoid these warnings by defining the argument size using the matching
define (DP_RECEIVER_CAP_SIZE, 15) instead of having it be a literal
(and incorrect) value (16).
Reported-by: coverity-bot <keescook+coverity-bot at chromium.org>
Addresses-Coverity-ID: 1527269 ("Memory - corruptions")
Addresses-Coverity-ID: 1527268 ("Memory - corruptions")
Link: https://lore.kernel.org/lkml/202211100848.FFBA2432 at keescook/
Link: https://lore.kernel.org/lkml/202211100848.F4C2819BB at keescook/
Fixes: 813443721331 ("drm/nouveau/disp: move DP link config into
acquire")
Reviewed-by: Lyude Paul <lyude at redhat.com>
Cc: Ben Skeggs <bskeggs at redhat.com>
Cc: Karol Herbst <kherbst at redhat.com>
Cc: David Airlie <airlied at gmail.com>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Dave Airlie <airlied at redhat.com>
Cc: "Gustavo A. R. Silva" <gustavo at embeddedor.com>
Cc: dri-devel at lists.freedesktop.org
Cc: nouveau at lists.freedesktop.org
Signed-off-by: Kees Cook <keescook at chromium.org>
Link: https://lore.kernel.org/r/20221127183036.never.139-kees at kernel.org
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
drivers/gpu/drm/nouveau/include/nvif/outp.h | 3 ++-
drivers/gpu/drm/nouveau/nvif/outp.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/include/nvif/outp.h
b/drivers/gpu/drm/nouveau/include/nvif/outp.h
index 45daadec3c0c7..fa76a7b5e4b37 100644
--- a/drivers/gpu/drm/nouveau/include/nvif/outp.h
+++ b/drivers/gpu/drm/nouveau/include/nvif/outp.h
@@ -3,6 +3,7 @@
#define __NVIF_OUTP_H__
#include <nvif/object.h>
#include <nvif/if0012.h>
+#include <drm/display/drm_dp.h>
struct nvif_disp;
struct nvif_outp {
@@ -21,7 +22,7 @@ int nvif_outp_acquire_rgb_crt(struct nvif_outp *);
int nvif_outp_acquire_tmds(struct nvif_outp *, int head,
bool hdmi, u8 max_ac_packet, u8 rekey, u8 scdc, bool hda);
int nvif_outp_acquire_lvds(struct nvif_outp *, bool dual, bool bpc8);
-int nvif_outp_acquire_dp(struct nvif_outp *, u8 dpcd[16],
+int nvif_outp_acquire_dp(struct nvif_outp *outp, u8 dpcd[DP_RECEIVER_CAP_SIZE],
int link_nr, int link_bw, bool hda, bool mst);
void nvif_outp_release(struct nvif_outp *);
int nvif_outp_infoframe(struct nvif_outp *, u8 type, struct
nvif_outp_infoframe_v0 *, u32 size);
diff --git a/drivers/gpu/drm/nouveau/nvif/outp.c
b/drivers/gpu/drm/nouveau/nvif/outp.c
index 7da39f1eae9fb..c24bc5eae3ecf 100644
--- a/drivers/gpu/drm/nouveau/nvif/outp.c
+++ b/drivers/gpu/drm/nouveau/nvif/outp.c
@@ -127,7 +127,7 @@ nvif_outp_acquire(struct nvif_outp *outp, u8 proto, struct
nvif_outp_acquire_v0
}
int
-nvif_outp_acquire_dp(struct nvif_outp *outp, u8 dpcd[16],
+nvif_outp_acquire_dp(struct nvif_outp *outp, u8 dpcd[DP_RECEIVER_CAP_SIZE],
int link_nr, int link_bw, bool hda, bool mst)
{
struct nvif_outp_acquire_v0 args;
--
2.39.2