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avcodec/cinepakenc: Fix invalid shifts 

Fixes: left shift of 1 by 31 places cannot be represented in type 'int'.
Affected the FATE-tests vsynth1-cinepak, vsynth2-cinepak and
vsynth_lena-cinepak. Also fixes ticket #8220.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andreas Rheinhardt 2019-10-06 07:23:14 +02:00 committed by Michael Niedermayer
parent 670fd3b0ec
commit e3650dcfc9
1 changed files with 6 additions and 5 deletions
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11
libavcodec/cinepakenc.c
View File

@ -544,8 +544,9 @@ static int encode_mode(CinepakEncContext *s, int h,
uint8_t *last_data[4], int last_linesize[4],
strip_info *info, unsigned char *buf)
{
int x, y, z, flags, bits, temp_size, header_ofs, ret = 0, mb_count = s->w * h / MB_AREA;
int x, y, z, bits, temp_size, header_ofs, ret = 0, mb_count = s->w * h / MB_AREA;
int needs_extra_bit, should_write_temp;
uint32_t flags;
unsigned char temp[64]; // 32/2 = 16 V4 blocks at 4 B each -> 64 B
mb_info *mb;
uint8_t *sub_scratch_data[4] = { 0 }, *sub_last_data[4] = { 0 };
@ -599,7 +600,7 @@ static int encode_mode(CinepakEncContext *s, int h,
flags = 0;
for (y = x; y < FFMIN(x + 32, mb_count); y++)
if (s->mb[y].best_encoding == ENC_V4)
flags |= 1 << (31 - y + x);
flags |= 1U << (31 - y + x);
AV_WB32(&buf[ret], flags);
ret += 4;
@ -626,13 +627,13 @@ static int encode_mode(CinepakEncContext *s, int h,
for (x = 0; x < mb_count; x++) {
mb = &s->mb[x];
flags |= (mb->best_encoding != ENC_SKIP) << (31 - bits++);
flags |= (uint32_t)(mb->best_encoding != ENC_SKIP) << (31 - bits++);
needs_extra_bit = 0;
should_write_temp = 0;
if (mb->best_encoding != ENC_SKIP) {
if (bits < 32)
flags |= (mb->best_encoding == ENC_V4) << (31 - bits++);
flags |= (uint32_t)(mb->best_encoding == ENC_V4) << (31 - bits++);
else
needs_extra_bit = 1;
}
@ -651,7 +652,7 @@ static int encode_mode(CinepakEncContext *s, int h,
}
if (needs_extra_bit) {
flags = (mb->best_encoding == ENC_V4) << 31;
flags = (uint32_t)(mb->best_encoding == ENC_V4) << 31;
bits = 1;
}