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37 lines
1.4 KiB
37 lines
1.4 KiB
From 9c84b7426660c09c18cc349f6d70b5f8168b5680 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Tue, 4 Dec 2018 16:33:42 +1100
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Subject: [PATCH] warc: consume data once read
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The warc decoder only used read ahead, it wouldn't actually consume
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data that had previously been printed. This means that if you specify
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an invalid content length, it will just reprint the same data over
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and over and over again until it hits the desired length.
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This means that a WARC resource with e.g.
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Content-Length: 666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666665
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but only a few hundred bytes of data, causes a quasi-infinite loop.
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Consume data in subsequent calls to _warc_read.
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Found with an AFL + afl-rb + qsym setup.
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---
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libarchive/archive_read_support_format_warc.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/libarchive/archive_read_support_format_warc.c b/libarchive/archive_read_support_format_warc.c
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index e8753853f..e8fc8428b 100644
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--- a/libarchive/archive_read_support_format_warc.c
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+++ b/libarchive/archive_read_support_format_warc.c
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@@ -386,6 +386,11 @@ _warc_read(struct archive_read *a, const void **buf, size_t *bsz, int64_t *off)
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return (ARCHIVE_EOF);
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}
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+ if (w->unconsumed) {
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+ __archive_read_consume(a, w->unconsumed);
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+ w->unconsumed = 0U;
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+ }
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+
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rab = __archive_read_ahead(a, 1U, &nrd);
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if (nrd < 0) {
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*bsz = 0U;
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