From 3858c755d90e0cefd5549f85a64967d7a163dd55 Mon Sep 17 00:00:00 2001 From: Andreas Rheinhardt Date: Sun, 6 Oct 2019 07:23:14 +0200 Subject: [PATCH] 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 Reviewed-by: Paul B Mahol Signed-off-by: Michael Niedermayer (cherry picked from commit e3650dcfc9cde6ceccf7bbc225962da196e2a386) Signed-off-by: Andreas Rheinhardt --- libavcodec/cinepakenc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/libavcodec/cinepakenc.c b/libavcodec/cinepakenc.c index 93917fafe8..6024df0fba 100644 --- a/libavcodec/cinepakenc.c +++ b/libavcodec/cinepakenc.c @@ -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; }