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Fix out of bound reads/writes in the TIFF decoder.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Laurent Aimar 2011-10-01 00:45:03 +02:00 committed by Michael Niedermayer
parent 4a7876c6e4
commit 5ca5d432e0
1 changed files with 25 additions and 15 deletions
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40
libavcodec/tiff.c
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@ -213,6 +213,8 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uin
}
switch(s->compr){
case TIFF_RAW:
if (ssrc + size - src < width)
return AVERROR_INVALIDDATA;
if (!s->fill_order) {
horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
} else {
@ -324,6 +326,8 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *
uint32_t *pal;
const uint8_t *rp, *gp, *bp;
if (end_buf - buf < 12)
return -1;
tag = tget_short(&buf, s->le);
type = tget_short(&buf, s->le);
count = tget_long(&buf, s->le);
@ -383,7 +387,7 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *
case TIFF_SHORT:
case TIFF_LONG:
s->bpp = 0;
for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
for(i = 0; i < count && buf < end_buf; i++) s->bpp += tget(&buf, type, s->le);
break;
default:
s->bpp = -1;
@ -497,6 +501,8 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *
case TIFF_PAL:
pal = (uint32_t *) s->palette;
off = type_sizes[type];
if (count / 3 > 256 || end_buf - buf < count / 3 * off * 3)
return -1;
rp = buf;
gp = buf + count / 3 * off;
bp = buf + count / 3 * off * 2;
@ -540,12 +546,16 @@ static int decode_frame(AVCodecContext *avctx,
AVFrame *picture = data;
AVFrame * const p= (AVFrame*)&s->picture;
const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
int id, le, off, ret;
unsigned off;
int id, le, ret;
int i, j, entries;
int stride, soff, ssize;
int stride;
unsigned soff, ssize;
uint8_t *dst;
//parse image header
if (end_buf - buf < 8)
return AVERROR_INVALIDDATA;
id = AV_RL16(buf); buf += 2;
if(id == 0x4949) le = 1;
else if(id == 0x4D4D) le = 0;
@ -565,9 +575,9 @@ static int decode_frame(AVCodecContext *avctx,
}
/* parse image file directory */
off = tget_long(&buf, le);
if(orig_buf + off + 14 >= end_buf){
if (off >= UINT_MAX - 14 || end_buf - orig_buf < off + 14) {
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
return -1;
return AVERROR_INVALIDDATA;
}
buf = orig_buf + off;
entries = tget_short(&buf, le);
@ -591,23 +601,23 @@ static int decode_frame(AVCodecContext *avctx,
stride = p->linesize[0];
dst = p->data[0];
for(i = 0; i < s->height; i += s->rps){
if(s->stripsizes)
if(s->stripsizes) {
if (s->stripsizes >= end_buf)
return AVERROR_INVALIDDATA;
ssize = tget(&s->stripsizes, s->sstype, s->le);
else
} else
ssize = s->stripsize;
if (ssize > buf_size) {
av_log(avctx, AV_LOG_ERROR, "Buffer size is smaller than strip size\n");
return -1;
}
if(s->stripdata){
if (s->stripdata >= end_buf)
return AVERROR_INVALIDDATA;
soff = tget(&s->stripdata, s->sot, s->le);
}else
soff = s->stripoff;
if (soff < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid stripoff: %d\n", soff);
return AVERROR(EINVAL);
if (soff > buf_size || ssize > buf_size - soff) {
av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
return -1;
}
if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0)
break;