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From 73331a6a0481067628f065ffe87bb1d8f787d10c Mon Sep 17 00:00:00 2001
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From: Hans Wennborg <hans@chromium.org>
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Date: Fri, 18 Aug 2023 11:05:33 +0200
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Subject: [PATCH] Reject overflows of zip header fields in minizip.
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This checks the lengths of the file name, extra field, and comment
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that would be put in the zip headers, and rejects them if they are
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too long. They are each limited to 65535 bytes in length by the zip
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format. This also avoids possible buffer overflows if the provided
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fields are too long.
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---
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contrib/minizip/zip.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/contrib/minizip/zip.c b/contrib/minizip/zip.c
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index 3d3d4ca..0446109 100644
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--- a/contrib/minizip/zip.c
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+++ b/contrib/minizip/zip.c
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@@ -1043,6 +1043,17 @@ extern int ZEXPORT zipOpenNewFileInZip4_64(zipFile file, const char* filename, c
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return ZIP_PARAMERROR;
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#endif
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+ // The filename and comment length must fit in 16 bits.
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+ if ((filename!=NULL) && (strlen(filename)>0xffff))
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+ return ZIP_PARAMERROR;
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+ if ((comment!=NULL) && (strlen(comment)>0xffff))
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+ return ZIP_PARAMERROR;
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+ // The extra field length must fit in 16 bits. If the member also requires
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+ // a Zip64 extra block, that will also need to fit within that 16-bit
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+ // length, but that will be checked for later.
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+ if ((size_extrafield_local>0xffff) || (size_extrafield_global>0xffff))
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+ return ZIP_PARAMERROR;
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+
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zi = (zip64_internal*)file;
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if (zi->in_opened_file_inzip == 1)
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--
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2.41.0
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