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From 8f48323c181e20b7e527b8be7229d6eb1148ec5f Mon Sep 17 00:00:00 2001
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From: Guido Draheim <guidod@gmx.de>
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Date: Tue, 13 Mar 2018 00:23:33 +0100
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Subject: [PATCH] check rootseek and rootsize to be positive #27
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---
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zzip/zip.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/zzip/zip.c b/zzip/zip.c
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index a5db9d8..6be8d7c 100644
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--- a/zzip/zip.c
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+++ b/zzip/zip.c
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@@ -318,6 +318,8 @@ __zzip_fetch_disk_trailer(int fd, zzip_off_t filesize,
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trailer->zz_rootseek = zzip_disk_trailer_rootseek(orig);
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trailer->zz_rootsize = zzip_disk_trailer_rootsize(orig);
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# endif
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+ if (trailer->zz_rootseek < 0 || trailer->zz_rootsize < 0)
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+ return(ZZIP_CORRUPTED); // forged value
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__fixup_rootseek(offset + tail - mapped, trailer);
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/*
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@@ -344,6 +346,8 @@ __zzip_fetch_disk_trailer(int fd, zzip_off_t filesize,
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zzip_disk64_trailer_finalentries(orig);
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trailer->zz_rootseek = zzip_disk64_trailer_rootseek(orig);
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trailer->zz_rootsize = zzip_disk64_trailer_rootsize(orig);
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+ if (trailer->zz_rootseek < 0 || trailer->zz_rootsize < 0)
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+ return(ZZIP_CORRUPTED); // forged value
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/*
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* "extract data from files archived in a single zip file."
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* So the file offsets must be within the current ZIP archive!
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