File libxml2-CVE-2017-18258.patch of Package python-libxml2

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File libxml2-CVE-2017-18258.patch of Package python-libxml2

From e2a9122b8dde53d320750451e9907a7dcb2ca8bb Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Thu, 7 Sep 2017 18:36:01 +0200
Subject: [PATCH] Set memory limit for LZMA decompression

Otherwise malicious LZMA compressed files could consume large amounts
of memory when decompressed.

According to the xz man page, files compressed with `xz -9` currently
require 65 MB to decompress, so set the limit to 100 MB.

Should fix bug 786696.
---
 xzlib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xzlib.c b/xzlib.c
index 782957f6..f43632bd 100644
--- a/xzlib.c
+++ b/xzlib.c
@@ -408,7 +408,7 @@ xz_head(xz_statep state)
         state->strm = init;
         state->strm.avail_in = 0;
         state->strm.next_in = NULL;
-        if (lzma_auto_decoder(&state->strm, UINT64_MAX, 0) != LZMA_OK) {
+        if (lzma_auto_decoder(&state->strm, 100000000, 0) != LZMA_OK) {
             xmlFree(state->out);
             xmlFree(state->in);
             state->size = 0;
-- 
2.18.0

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File libxml2-CVE-2017-18258.patch of Package python-libxml2

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