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Code Issues Releases Activity

avcodec/cfhd: Use bytestream2 for peaks

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This fixes out of array accesses
No testcase known

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-07-14 00:26:08 +02:00
parent 91578f5798
commit 4a657acaef
2 changed files with 7 additions and 6 deletions
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10
libavcodec/cfhd.c
View File

@ -79,7 +79,7 @@ static void init_peak_table_defaults(CFHDContext *s)
{
s->peak.level = 0;
s->peak.offset = 0;
s->peak.base = NULL;
memset(&s->peak.base, 0, sizeof(s->peak.base));
}
static void init_frame_defaults(CFHDContext *s)
@ -133,7 +133,7 @@ static inline void peak_table(int16_t *band, Peak *peak, int length)
int i;
for (i = 0; i < length; i++)
if (abs(band[i]) > peak->level)
band[i] = *(peak->base++);
band[i] = bytestream2_get_le16(&peak->base);
}
static inline void process_alpha(int16_t *alpha, int width)
@ -537,16 +537,16 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
} else if (tag == -75) {
s->peak.offset &= ~0xffff;
s->peak.offset |= (data & 0xffff);
s->peak.base = (int16_t *) gb.buffer;
s->peak.base = gb;
s->peak.level = 0;
} else if (tag == -76) {
s->peak.offset &= 0xffff;
s->peak.offset |= (data & 0xffffU)<<16;
s->peak.base = (int16_t *) gb.buffer;
s->peak.base = gb;
s->peak.level = 0;
} else if (tag == -74 && s->peak.offset) {
s->peak.level = data;
s->peak.base += s->peak.offset / 2 - 2;
bytestream2_seek(&s->peak.base, s->peak.offset - 4, SEEK_CUR);
} else
av_log(avctx, AV_LOG_DEBUG, "Unknown tag %i data %x\n", tag, data);

3
libavcodec/cfhd.h
View File

@ -26,6 +26,7 @@
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "vlc.h"
@ -71,7 +72,7 @@ typedef struct Plane {
typedef struct Peak {
int level;
int offset;
const int16_t *base;
GetByteContext base;
} Peak;
typedef struct CFHDContext {