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Fix some pipelines to be safe if downstream write fails (fuzz issue 28262)

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This commit is contained in:
Jay Berkenbilt 2021-01-04 11:55:28 -05:00
parent a9bdeeb0e0
commit dc92574c10
6 changed files with 17 additions and 6 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2021-01-04 Jay Berkenbilt <ejb@ql.org>
* Move getNext()->write() calls in some pipelines to ensure that
state gates properly reset even if the next pipeline's write
throws an exception (fuzz issue 28262).
2021-01-03 Jay Berkenbilt <ejb@ql.org>
* Don't include -o nospace with zsh completion setup so file

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fuzz/qpdf_extra/28262.fuzz Normal file
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2
libqpdf/Pl_AES_PDF.cc
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@ -238,6 +238,6 @@ Pl_AES_PDF::flush(bool strip_padding)
}
}
}
getNext()->write(this->outbuf, bytes);
this->offset = 0;
getNext()->write(this->outbuf, bytes);
}

7
libqpdf/Pl_ASCII85Decoder.cc
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@ -119,10 +119,13 @@ Pl_ASCII85Decoder::flush()
QTC::TC("libtests", "Pl_ASCII85Decoder partial flush",
(this->pos == 5) ? 0 : 1);
getNext()->write(outbuf, this->pos - 1);
// Reset before calling getNext()->write in case that throws an
// exception.
auto t = this->pos - 1;
this->pos = 0;
memset(this->inbuf, 117, 5);
getNext()->write(outbuf, t);
}
void

6
libqpdf/Pl_ASCIIHexDecoder.cc
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@ -97,12 +97,14 @@ Pl_ASCIIHexDecoder::flush()
QTC::TC("libtests", "Pl_ASCIIHexDecoder partial flush",
(this->pos == 2) ? 0 : 1);
getNext()->write(&ch, 1);
// Reset before calling getNext()->write in case that throws an
// exception.
this->pos = 0;
this->inbuf[0] = '0';
this->inbuf[1] = '0';
this->inbuf[2] = '\0';
getNext()->write(&ch, 1);
}
void

2
libqpdf/Pl_Count.cc
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@ -27,8 +27,8 @@ Pl_Count::write(unsigned char* buf, size_t len)
if (len)
{
this->m->count += QIntC::to_offset(len);
getNext()->write(buf, len);
this->m->last_char = buf[len - 1];
getNext()->write(buf, len);
}
}