Right now, the variables that define the max number of
delay frames is defined as:
#define VIDEO_FRAME_DELAY 2
#define MAX_NUM_VIDEO_DELAY_FRAMES (VIDEO_FRAME_DELAY + 1)
#define NUM_PREVIEW_DVS_FRAMES (2)
#define MAX_NUM_DELAY_FRAMES MAX(MAX_NUM_VIDEO_DELAY_FRAMES,
NUM_PREVIEW_DVS_FRAMES)
In other words, we have:
MAX_NUM_VIDEO_DELAY_FRAMES = 3
MAX_NUM_DELAY_FRAMES = 2
The MAX_NUM_DELAY_FRAMES macro is used only only when allocating
memory. On all other parts, including looping over such array,
MAX_NUM_VIDEO_DELAY_FRAMES is used instead, like:
void sh_css_binary_args_reset(struct sh_css_binary_args *args)
{
unsigned int i;
...
for (i = 0; i < MAX_NUM_VIDEO_DELAY_FRAMES; i++)
args->delay_frames[i] = NULL;
Which will cause buffer overflows, with may override the next array
(tnr_frames[]).
In practice, this may not be causing real issues, as the code
checks for num_delay_frames on some parts (but not everywhere).
So, get rid of the smallest value.
Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
---
drivers/staging/media/atomisp/pci/ia_css_pipe.h | 2 +-
drivers/staging/media/atomisp/pci/sh_css_defs.h | 2 --
2 files changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/staging/media/atomisp/pci/ia_css_pipe.h
b/drivers/staging/media/atomisp/pci/ia_css_pipe.h
index 91653952f1a7..9c9e1264feb0 100644
--- a/drivers/staging/media/atomisp/pci/ia_css_pipe.h
+++ b/drivers/staging/media/atomisp/pci/ia_css_pipe.h
@@ -31,7 +31,7 @@ struct ia_css_preview_settings {
struct ia_css_binary vf_pp_binary;
/* 2401 only for these two - do we in fact use them for anything real */
- struct ia_css_frame *delay_frames[MAX_NUM_DELAY_FRAMES];
+ struct ia_css_frame *delay_frames[MAX_NUM_VIDEO_DELAY_FRAMES];
struct ia_css_frame *tnr_frames[NUM_TNR_FRAMES];
struct ia_css_pipe *copy_pipe;
diff --git a/drivers/staging/media/atomisp/pci/sh_css_defs.h
b/drivers/staging/media/atomisp/pci/sh_css_defs.h
index fcd5081edf82..d444af82c309 100644
--- a/drivers/staging/media/atomisp/pci/sh_css_defs.h
+++ b/drivers/staging/media/atomisp/pci/sh_css_defs.h
@@ -225,8 +225,6 @@ RGB[0,8191],coef[-8192,8191] -> RGB[0,8191]
#define NUM_VIDEO_TNR_FRAMES 2
-#define MAX_NUM_DELAY_FRAMES MAX(MAX_NUM_VIDEO_DELAY_FRAMES,
NUM_PREVIEW_DVS_FRAMES)
-
/* Note that this is the define used to configure all data structures common
for all modes */
/* It should be equal or bigger to the max number of DVS frames for all
possible modes */
/* Rules: these implement logic shared between the host code and ISP firmware.
--
2.26.2
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