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提交 cdbaa436 编写于 作者: V Vittorio Giovara 提交者： Diego Biurrun
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mpeg12dec: Always close reader on error 

A reader left open may lead to hangs.
Signed-off-by: NVittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: NDiego Biurrun <diego@biurrun.de>
上级 7a00653b
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Showing with 48 addition and 15 deletion
libavcodec/mpeg12dec.c
浏览文件 @ cdbaa436
......@@ -128,9 +128,10 @@ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
return sign_extend(val, 5 + shift);
}
#define MAX_INDEX (64 - 1)
#define check_scantable_index(ctx, x) \
do { \
if ((x) > 63) { \
if ((x) > MAX_INDEX) { \
av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
ctx->mb_x, ctx->mb_y); \
return AVERROR_INVALIDDATA; \
......@@ -170,7 +171,8 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
break;
} else if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level - 1) | 1;
......@@ -192,7 +194,8 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
LAST_SKIP_BITS(re, &s->gb, 8);
}
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = -level;
......@@ -209,6 +212,9 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
}
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......@@ -250,7 +256,8 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = (level - 1) | 1;
......@@ -272,7 +279,8 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
SKIP_BITS(re, &s->gb, 8);
}
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = -level;
......@@ -294,6 +302,9 @@ end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......@@ -330,7 +341,8 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale) >> 1;
level = (level - 1) | 1;
......@@ -352,7 +364,8 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
SKIP_BITS(re, &s->gb, 8);
}
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = -level;
......@@ -374,6 +387,9 @@ end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......@@ -419,7 +435,8 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
......@@ -434,7 +451,8 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
SKIP_BITS(re, &s->gb, 12);
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
......@@ -456,6 +474,8 @@ end:
}
block[63] ^= (mismatch & 1);
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......@@ -489,7 +509,8 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale) >> 1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
......@@ -504,7 +525,8 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
SKIP_BITS(re, &s->gb, 12);
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = ((-level * 2 + 1) * qscale) >> 1;
......@@ -522,6 +544,9 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......@@ -572,7 +597,8 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
break;
} else if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
......@@ -586,7 +612,8 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_BITS(re, &s->gb, 12);
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = (-level * qscale * quant_matrix[j]) >> 4;
......@@ -603,6 +630,8 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s,
}
block[63] ^= mismatch & 1;
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......@@ -650,7 +679,8 @@ static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
break;
} else if (level != 0) {
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
......@@ -664,7 +694,8 @@ static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_BITS(re, &s->gb, 12);
i += run;
check_scantable_index(s, i);
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = (-level * qscale * quant_matrix[j]) >> 4;
......@@ -679,6 +710,8 @@ static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
......
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