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Protect against invalid predictor buffer size.

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Michael R Sweet 2025-04-23 10:07:26 -04:00
parent 67704ce493
commit 404ca72882
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1 changed files with 19 additions and 1 deletions
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20
pdfio-stream.c
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@ -562,6 +562,13 @@ _pdfioStreamOpen(pdfio_obj_t *obj, // I - Object
if (predictor >= 10)
st->pbsize ++; // Add PNG predictor byte
if (st->pbsize < 2)
{
_pdfioFileError(st->pdf, "Bad Predictor buffer size %lu.", (unsigned long)st->pbsize);
goto error;
}
PDFIO_DEBUG("_pdfioStreamOpen: st->predictor=%d, st->pbpixel=%u, st->pbsize=%lu\n", st->predictor, (unsigned)st->pbpixel, (unsigned long)st->pbsize);
if ((st->prbuffer = calloc(1, st->pbsize - 1)) == NULL || (st->psbuffer = calloc(1, st->pbsize)) == NULL)
{
_pdfioFileError(st->pdf, "Unable to allocate %lu bytes for Predictor buffers.", (unsigned long)st->pbsize);
@ -1228,7 +1235,18 @@ stream_read(pdfio_stream_t *st, // I - Stream
}
// Apply predictor for this line
PDFIO_DEBUG("stream_read: Line %02X %02X %02X %02X %02X.\n", sptr[-1], sptr[0], sptr[0], sptr[2], sptr[3]);
#ifdef DEBUG
if (remaining > 4)
PDFIO_DEBUG("stream_read: Line %02X %02X %02X %02X %02X ...\n", sptr[-1], sptr[0], sptr[1], sptr[2], sptr[3]);
else if (remaining > 3)
PDFIO_DEBUG("stream_read: Line %02X %02X %02X %02X %02X.\n", sptr[-1], sptr[0], sptr[1], sptr[2], sptr[3]);
else if (remaining > 2)
PDFIO_DEBUG("stream_read: Line %02X %02X %02X %02X.\n", sptr[-1], sptr[0], sptr[1], sptr[2]);
else if (remaining > 1)
PDFIO_DEBUG("stream_read: Line %02X %02X %02X.\n", sptr[-1], sptr[0], sptr[1]);
else
PDFIO_DEBUG("stream_read: Line %02X %02X.\n", sptr[-1], sptr[0]);
#endif // DEBUG
switch (sptr[-1])
{