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Code Issues Releases Activity

avcodec/me_cmp, motion_est: Sanitize permissible cmp_funcs

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Several of the potential choices of comparison functions
need an initialized MpegEncContext (initialized for encoding,
not only ff_mpv_common_init()) or they crash when called.
Modify ff_set_cmp() to check for this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-05-12 23:15:46 +02:00
parent b1a31b32ab
commit d163eefd47
8 changed files with 74 additions and 78 deletions
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2
libavcodec/dvenc.c
View File

@ -100,7 +100,7 @@ static av_cold int dvvideo_encode_init(AVCodecContext *avctx)
memset(&mecc,0, sizeof(mecc));
ff_me_cmp_init(&mecc, avctx);
ret = ff_set_cmp(&mecc, ildct_cmp, avctx->ildct_cmp);
ret = ff_set_cmp(&mecc, ildct_cmp, avctx->ildct_cmp, 0);
if (ret < 0)
return ret;
if (!ildct_cmp[5])

118
libavcodec/me_cmp.c
View File

@ -20,6 +20,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stddef.h>
#include "libavutil/attributes.h"
#include "libavutil/internal.h"
#include "libavutil/mem_internal.h"
@ -473,74 +475,60 @@ static int zero_cmp(MpegEncContext *s, const uint8_t *a, const uint8_t *b,
return 0;
}
int ff_set_cmp(const MECmpContext *c, me_cmp_func *cmp, int type)
av_cold int ff_set_cmp(const MECmpContext *c, me_cmp_func *cmp, int type, int mpvenc)
{
int ret = 0;
int i;
memset(cmp, 0, sizeof(void *) * 6);
for (i = 0; i < 6; i++) {
switch (type & 0xFF) {
case FF_CMP_SAD:
cmp[i] = c->sad[i];
break;
case FF_CMP_MEDIAN_SAD:
cmp[i] = c->median_sad[i];
break;
case FF_CMP_SATD:
cmp[i] = c->hadamard8_diff[i];
break;
case FF_CMP_SSE:
cmp[i] = c->sse[i];
break;
case FF_CMP_DCT:
cmp[i] = c->dct_sad[i];
break;
case FF_CMP_DCT264:
cmp[i] = c->dct264_sad[i];
break;
case FF_CMP_DCTMAX:
cmp[i] = c->dct_max[i];
break;
case FF_CMP_PSNR:
cmp[i] = c->quant_psnr[i];
break;
case FF_CMP_BIT:
cmp[i] = c->bit[i];
break;
case FF_CMP_RD:
cmp[i] = c->rd[i];
break;
case FF_CMP_VSAD:
cmp[i] = c->vsad[i];
break;
case FF_CMP_VSSE:
cmp[i] = c->vsse[i];
break;
case FF_CMP_ZERO:
cmp[i] = zero_cmp;
break;
case FF_CMP_NSSE:
cmp[i] = c->nsse[i];
break;
#if CONFIG_DWT
case FF_CMP_W53:
cmp[i]= c->w53[i];
break;
case FF_CMP_W97:
cmp[i]= c->w97[i];
break;
#endif
default:
av_log(NULL, AV_LOG_ERROR,
"invalid cmp function selection\n");
ret = -1;
break;
}
#define ENTRY(CMP_FLAG, ARRAY, MPVENC_ONLY) \
[FF_CMP_ ## CMP_FLAG] = { \
.offset = offsetof(MECmpContext, ARRAY), \
.mpv_only = MPVENC_ONLY, \
.available = 1, \
}
static const struct {
char available;
char mpv_only;
uint16_t offset;
} cmp_func_list[] = {
ENTRY(SAD, sad, 0),
ENTRY(SSE, sse, 0),
ENTRY(SATD, hadamard8_diff, 0),
ENTRY(DCT, dct_sad, 1),
ENTRY(PSNR, quant_psnr, 1),
ENTRY(BIT, bit, 1),
ENTRY(RD, rd, 1),
ENTRY(VSAD, vsad, 0),
ENTRY(VSSE, vsse, 0),
ENTRY(NSSE, nsse, 0),
#if CONFIG_SNOW_DECODER || CONFIG_SNOW_ENCODER
ENTRY(W53, w53, 0),
ENTRY(W97, w97, 0),
#endif
ENTRY(DCTMAX, dct_max, 1),
#if CONFIG_GPL
ENTRY(DCT264, dct264_sad, 1),
#endif
ENTRY(MEDIAN_SAD, median_sad, 0),
};
const me_cmp_func *me_cmp_func_array;
return ret;
type &= 0xFF;
if (type == FF_CMP_ZERO) {
for (int i = 0; i < 6; i++)
cmp[i] = zero_cmp;
return 0;
}
if (type > FF_ARRAY_ELEMS(cmp_func_list) ||
!cmp_func_list[type].available ||
!mpvenc && cmp_func_list[type].mpv_only) {
av_log(NULL, AV_LOG_ERROR,
"invalid cmp function selection\n");
return AVERROR(EINVAL);
}
me_cmp_func_array = (const me_cmp_func*)(((const char*)c) + cmp_func_list[type].offset);
for (int i = 0; i < 6; i++)
cmp[i] = me_cmp_func_array[i];
return 0;
}
#define BUTTERFLY2(o1, o2, i1, i2) \

9
libavcodec/me_cmp.h
View File

@ -83,7 +83,14 @@ void ff_me_cmp_init_riscv(MECmpContext *c, AVCodecContext *avctx);
void ff_me_cmp_init_x86(MECmpContext *c, AVCodecContext *avctx);
void ff_me_cmp_init_mips(MECmpContext *c, AVCodecContext *avctx);
int ff_set_cmp(const MECmpContext *c, me_cmp_func *cmp, int type);
/**
* Fill the function pointer array cmp[6] with me_cmp_funcs from
* c based upon type. If mpvenc is not set, an error is returned
* if the type of comparison functions requires an initialized
* MpegEncContext.
*/
int ff_set_cmp(const MECmpContext *c, me_cmp_func *cmp,
int type, int mpvenc);
void ff_dsputil_init_dwt(MECmpContext *c);

11
libavcodec/motion_est.c
View File

@ -305,7 +305,8 @@ static int zero_cmp(MpegEncContext *s, const uint8_t *a, const uint8_t *b,
static void zero_hpel(uint8_t *a, const uint8_t *b, ptrdiff_t stride, int h){
}
av_cold int ff_me_init(MotionEstContext *c, AVCodecContext *avctx, const MECmpContext *mecc)
av_cold int ff_me_init(MotionEstContext *c, AVCodecContext *avctx,
const MECmpContext *mecc, int mpvenc)
{
int cache_size = FFMIN(ME_MAP_SIZE>>ME_MAP_SHIFT, 1<<ME_MAP_SHIFT);
int dia_size = FFMAX(FFABS(avctx->dia_size) & 255, FFABS(avctx->pre_dia_size) & 255);
@ -324,10 +325,10 @@ av_cold int ff_me_init(MotionEstContext *c, AVCodecContext *avctx, const MECmpCo
if (cache_size < 2 * dia_size)
av_log(avctx, AV_LOG_INFO, "ME_MAP size may be a little small for the selected diamond size\n");
ret = ff_set_cmp(mecc, c->me_pre_cmp, avctx->me_pre_cmp);
ret |= ff_set_cmp(mecc, c->me_cmp, avctx->me_cmp);
ret |= ff_set_cmp(mecc, c->me_sub_cmp, avctx->me_sub_cmp);
ret |= ff_set_cmp(mecc, c->mb_cmp, avctx->mb_cmp);
ret = ff_set_cmp(mecc, c->me_pre_cmp, avctx->me_pre_cmp, mpvenc);
ret |= ff_set_cmp(mecc, c->me_cmp, avctx->me_cmp, mpvenc);
ret |= ff_set_cmp(mecc, c->me_sub_cmp, avctx->me_sub_cmp, mpvenc);
ret |= ff_set_cmp(mecc, c->mb_cmp, avctx->mb_cmp, mpvenc);
if (ret < 0)
return ret;

2
libavcodec/motion_est.h
View File

@ -115,7 +115,7 @@ static inline int ff_h263_round_chroma(int x)
* Performs one-time initialization of the MotionEstContext.
*/
int ff_me_init(MotionEstContext *c, struct AVCodecContext *avctx,
const struct MECmpContext *mecc);
const struct MECmpContext *mecc, int mpvenc);
void ff_me_init_pic(struct MpegEncContext *s);

6
libavcodec/mpegvideo_enc.c
View File

@ -312,15 +312,15 @@ static av_cold int me_cmp_init(MpegEncContext *s, AVCodecContext *avctx)
int ret;
ff_me_cmp_init(&s->mecc, avctx);
ret = ff_me_init(&s->me, avctx, &s->mecc);
ret = ff_me_init(&s->me, avctx, &s->mecc, 1);
if (ret < 0)
return ret;
ret = ff_set_cmp(&s->mecc, me_cmp, s->frame_skip_cmp);
ret = ff_set_cmp(&s->mecc, me_cmp, s->frame_skip_cmp, 1);
if (ret < 0)
return ret;
s->frame_skip_cmp_fn = me_cmp[1];
if (avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT) {
ret = ff_set_cmp(&s->mecc, me_cmp, avctx->ildct_cmp);
ret = ff_set_cmp(&s->mecc, me_cmp, avctx->ildct_cmp, 1);
if (ret < 0)
return ret;
if (!me_cmp[0] || !me_cmp[4])

2
libavcodec/snowenc.c
View File

@ -217,7 +217,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
mcf(12,12)
ff_me_cmp_init(&enc->mecc, avctx);
ret = ff_me_init(&enc->m.me, avctx, &enc->mecc);
ret = ff_me_init(&enc->m.me, avctx, &enc->mecc, 0);
if (ret < 0)
return ret;
ff_mpegvideoencdsp_init(&enc->mpvencdsp, avctx);

2
libavcodec/svq1enc.c
View File

@ -589,7 +589,7 @@ static av_cold int svq1_encode_init(AVCodecContext *avctx)
ff_hpeldsp_init(&s->hdsp, avctx->flags);
ff_me_cmp_init(&s->mecc, avctx);
ret = ff_me_init(&s->m.me, avctx, &s->mecc);
ret = ff_me_init(&s->m.me, avctx, &s->mecc, 0);
if (ret < 0)
return ret;
ff_mpegvideoencdsp_init(&s->m.mpvencdsp, avctx);