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authorMichael Niedermayer <michaelni@gmx.at>2014-04-13 03:01:03 +0200
committerMichael Niedermayer <michaelni@gmx.at>2014-04-13 03:20:09 +0200
commit94cf83ff91b2380e487211a0444bcd4ac9b58b75 (patch)
tree9f7b191c15551537eb2a446c738116b834bfbfb8
parent31876ea620064b00c41ab87c3bb49cf9c6e098eb (diff)
parent0a467a9b594dd67aa96bad687d05f8845b009f18 (diff)
downloadffmpeg-94cf83ff91b2380e487211a0444bcd4ac9b58b75.tar.gz
Merge commit '0a467a9b594dd67aa96bad687d05f8845b009f18'
* commit '0a467a9b594dd67aa96bad687d05f8845b009f18': tiffdec: use bytestream2 to simplify overread/overwrite protection Conflicts: libavcodec/tiff.c See: 1ec83d9a9e472f485897ac92bad9631d551a8c5b Merged-by: Michael Niedermayer <michaelni@gmx.at>
-rw-r--r--libavcodec/tiff.c72
-rw-r--r--libavcodec/tiff_common.c18
2 files changed, 46 insertions, 44 deletions
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index 53cdcd0e9f..69d1bb2381 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -383,9 +383,10 @@ static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,
static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
const uint8_t *src, int size, int lines)
{
+ PutByteContext pb;
int c, line, pixels, code, ret;
const uint8_t *ssrc = src;
- int width = ((s->width * s->bpp) + 7) >> 3;
+ int width = ((s->width * s->bpp) + 7) >> 3;
if (s->planar)
width /= s->bppcount;
@@ -416,21 +417,42 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
return ret;
}
+ for (line = 0; line < lines; line++) {
+ pixels = ff_lzw_decode(s->lzw, dst, width);
+ if (pixels < width) {
+ av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
+ pixels, width);
+ return AVERROR_INVALIDDATA;
+ }
+ if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
+ horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
+ dst += stride;
+ }
+ return 0;
}
if (s->compr == TIFF_CCITT_RLE ||
s->compr == TIFF_G3 ||
s->compr == TIFF_G4) {
return tiff_unpack_fax(s, dst, stride, src, size, width, lines);
}
+
+ bytestream2_init(&s->gb, src, size);
+ bytestream2_init_writer(&pb, dst, stride * lines);
+
for (line = 0; line < lines; line++) {
if (src - ssrc > size) {
av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
return AVERROR_INVALIDDATA;
}
+
+ if (bytestream2_get_bytes_left(&s->gb) == 0 || bytestream2_get_eof(&pb))
+ break;
+ bytestream2_seek_p(&pb, stride * line, SEEK_SET);
switch (s->compr) {
case TIFF_RAW:
if (ssrc + size - src < width)
return AVERROR_INVALIDDATA;
+
if (!s->fill_order) {
horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),
dst, 1, src, 0, width, 0);
@@ -479,16 +501,6 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
dst[i] = ff_reverse[dst[i]];
}
break;
- case TIFF_LZW:
- pixels = ff_lzw_decode(s->lzw, dst, width);
- if (pixels < width) {
- av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
- pixels, width);
- return AVERROR_INVALIDDATA;
- }
- if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
- horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
- break;
}
dst += stride;
}
@@ -580,7 +592,8 @@ static void set_sar(TiffContext *s, unsigned tag, unsigned num, unsigned den)
static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
{
unsigned tag, type, count, off, value = 0, value2 = 0;
- int i, j, k, pos, start;
+ int i, start;
+ int j, k, pos;
int ret;
uint32_t *pal;
double *dp;
@@ -702,35 +715,25 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
break;
case TIFF_STRIP_OFFS:
if (count == 1) {
- s->strippos = 0;
- s->stripoff = value;
+ s->strippos = 0;
+ s->stripoff = value;
} else
s->strippos = off;
s->strips = count;
if (s->strips == 1)
s->rps = s->height;
s->sot = type;
- if (s->strippos > bytestream2_size(&s->gb)) {
- av_log(s->avctx, AV_LOG_ERROR,
- "Tag referencing position outside the image\n");
- return AVERROR_INVALIDDATA;
- }
break;
case TIFF_STRIP_SIZE:
if (count == 1) {
s->stripsizesoff = 0;
- s->stripsize = value;
- s->strips = 1;
+ s->stripsize = value;
+ s->strips = 1;
} else {
s->stripsizesoff = off;
}
s->strips = count;
s->sstype = type;
- if (s->stripsizesoff > bytestream2_size(&s->gb)) {
- av_log(s->avctx, AV_LOG_ERROR,
- "Tag referencing position outside the image\n");
- return AVERROR_INVALIDDATA;
- }
break;
case TIFF_XRES:
case TIFF_YRES:
@@ -771,11 +774,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
}
s->fill_order = value - 1;
break;
- case TIFF_PAL:
+ case TIFF_PAL: {
pal = (uint32_t *) s->palette;
off = type_sizes[type];
- if (count / 3 > 256 || bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
+ if (count / 3 > 256 ||
+ bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
return AVERROR_INVALIDDATA;
+
off = (type_sizes[type] - 1) << 3;
for (k = 2; k >= 0; k--) {
for (i = 0; i < count / 3; i++) {
@@ -787,6 +792,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
}
s->palette_is_set = 1;
break;
+ }
case TIFF_PLANAR:
s->planar = value == 2;
break;
@@ -1019,12 +1025,14 @@ static int decode_frame(AVCodecContext *avctx,
if (s->stripsizesoff) {
if (s->stripsizesoff >= (unsigned)avpkt->size)
return AVERROR_INVALIDDATA;
- bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff, avpkt->size - s->stripsizesoff);
+ bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff,
+ avpkt->size - s->stripsizesoff);
}
if (s->strippos) {
if (s->strippos >= (unsigned)avpkt->size)
return AVERROR_INVALIDDATA;
- bytestream2_init(&stripdata, avpkt->data + s->strippos, avpkt->size - s->strippos);
+ bytestream2_init(&stripdata, avpkt->data + s->strippos,
+ avpkt->size - s->strippos);
}
if (s->rps <= 0) {
@@ -1038,12 +1046,12 @@ static int decode_frame(AVCodecContext *avctx,
dst = p->data[plane];
for (i = 0; i < s->height; i += s->rps) {
if (s->stripsizesoff)
- ssize = ff_tget(&stripsizes, s->sstype, s->le);
+ ssize = ff_tget(&stripsizes, s->sstype, le);
else
ssize = s->stripsize;
if (s->strippos)
- soff = ff_tget(&stripdata, s->sot, s->le);
+ soff = ff_tget(&stripdata, s->sot, le);
else
soff = s->stripoff;
diff --git a/libavcodec/tiff_common.c b/libavcodec/tiff_common.c
index fc34087c6b..f14ecf1769 100644
--- a/libavcodec/tiff_common.c
+++ b/libavcodec/tiff_common.c
@@ -42,15 +42,13 @@ int ff_tis_ifd(unsigned tag)
unsigned ff_tget_short(GetByteContext *gb, int le)
{
- unsigned v = le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
- return v;
+ return le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
}
unsigned ff_tget_long(GetByteContext *gb, int le)
{
- unsigned v = le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
- return v;
+ return le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
}
@@ -64,14 +62,10 @@ double ff_tget_double(GetByteContext *gb, int le)
unsigned ff_tget(GetByteContext *gb, int type, int le)
{
switch (type) {
- case TIFF_BYTE:
- return bytestream2_get_byte(gb);
- case TIFF_SHORT:
- return ff_tget_short(gb, le);
- case TIFF_LONG:
- return ff_tget_long(gb, le);
- default:
- return UINT_MAX;
+ case TIFF_BYTE: return bytestream2_get_byte(gb);
+ case TIFF_SHORT: return ff_tget_short(gb, le);
+ case TIFF_LONG: return ff_tget_long(gb, le);
+ default: return UINT_MAX;
}
}