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From 2240fbf5912054af025fb6e01e26375100275e74 Mon Sep 17 00:00:00 2001
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From: Nick Wellnhofer <wellnhofer@aevum.de>
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Date: Mon, 30 Jul 2018 13:14:11 +0200
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Subject: [PATCH] Fix infinite loop in LZMA decompression
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Check the liblzma error code more thoroughly to avoid infinite loops.
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Closes: https://gitlab.gnome.org/GNOME/libxml2/issues/13
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Closes: https://bugzilla.gnome.org/show_bug.cgi?id=794914
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This is CVE-2018-9251 and CVE-2018-14567.
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Thanks to Dongliang Mu and Simon Wörner for the reports.
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---
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xzlib.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/xzlib.c b/xzlib.c
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index a839169e..0ba88cfa 100644
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--- a/xzlib.c
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+++ b/xzlib.c
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@@ -562,6 +562,10 @@ xz_decomp(xz_statep state)
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"internal error: inflate stream corrupt");
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return -1;
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}
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+ /*
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+ * FIXME: Remapping a couple of error codes and falling through
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+ * to the LZMA error handling looks fragile.
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+ */
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if (ret == Z_MEM_ERROR)
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ret = LZMA_MEM_ERROR;
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if (ret == Z_DATA_ERROR)
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@@ -587,6 +591,11 @@ xz_decomp(xz_statep state)
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xz_error(state, LZMA_PROG_ERROR, "compression error");
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return -1;
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}
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+ if ((state->how != GZIP) &&
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+ (ret != LZMA_OK) && (ret != LZMA_STREAM_END)) {
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+ xz_error(state, ret, "lzma error");
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+ return -1;
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+ }
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} while (strm->avail_out && ret != LZMA_STREAM_END);
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/* update available output and crc check value */
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--
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2.22.0
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