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Fix CVE-2017-15587.
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15587
https://nandynarwhals.org/CVE-2017-15587/
Copied from upstream:
<https://git.ghostscript.com/?p=mupdf.git;h=82df2631d7d0446b206ea6b434ea609b6c28b0e8>
diff --git a/source/pdf/pdf-xref.c b/source/pdf/pdf-xref.c
index 66bd0ed..6292793 100644
--- a/source/pdf/pdf-xref.c
+++ b/source/pdf/pdf-xref.c
@@ -924,7 +924,7 @@ pdf_read_new_xref_section(fz_context *ctx, pdf_document *doc, fz_stream *stm, fz
pdf_xref_entry *table;
int i, n;
- if (i0 < 0 || i1 < 0)
+ if (i0 < 0 || i1 < 0 || (i0+i1) < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "negative xref stream entry index");
//if (i0 + i1 > pdf_xref_len(ctx, doc))
// fz_throw(ctx, FZ_ERROR_GENERIC, "xref stream has too many entries");
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