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-rw-r--r--mupdf/pdf_open.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mupdf/pdf_open.c b/mupdf/pdf_open.c
index d51e062b..b9bd883f 100644
--- a/mupdf/pdf_open.c
+++ b/mupdf/pdf_open.c
@@ -106,6 +106,8 @@ readoldtrailer(pdf_xref *xref, char *buf, int cap)
s = buf;
ofs = atoi(strsep(&s, " "));
+ if (!s)
+ return fz_throw("invalid range marker in xref");
len = atoi(strsep(&s, " "));
/* broken pdfs where the section is not on a separate line */