|
 |
026269 |
From 2240fbf5912054af025fb6e01e26375100275e74 Mon Sep 17 00:00:00 2001
|
|
|
026269 |
From: Nick Wellnhofer <wellnhofer@aevum.de>
|
|
|
026269 |
Date: Mon, 30 Jul 2018 13:14:11 +0200
|
|
|
026269 |
Subject: [PATCH] Fix infinite loop in LZMA decompression
|
|
|
026269 |
MIME-Version: 1.0
|
|
|
026269 |
Content-Type: text/plain; charset=UTF-8
|
|
|
026269 |
Content-Transfer-Encoding: 8bit
|
|
|
026269 |
|
|
|
026269 |
Check the liblzma error code more thoroughly to avoid infinite loops.
|
|
|
026269 |
|
|
|
026269 |
Closes: https://gitlab.gnome.org/GNOME/libxml2/issues/13
|
|
|
026269 |
Closes: https://bugzilla.gnome.org/show_bug.cgi?id=794914
|
|
|
026269 |
|
|
|
026269 |
This is CVE-2018-9251 and CVE-2018-14567.
|
|
|
026269 |
|
|
|
026269 |
Thanks to Dongliang Mu and Simon Wörner for the reports.
|
|
|
026269 |
---
|
|
|
026269 |
xzlib.c | 9 +++++++++
|
|
|
026269 |
1 file changed, 9 insertions(+)
|
|
|
026269 |
|
|
|
026269 |
diff --git a/xzlib.c b/xzlib.c
|
|
|
026269 |
index a839169e..0ba88cfa 100644
|
|
|
026269 |
--- a/xzlib.c
|
|
|
026269 |
+++ b/xzlib.c
|
|
|
026269 |
@@ -562,6 +562,10 @@ xz_decomp(xz_statep state)
|
|
|
026269 |
"internal error: inflate stream corrupt");
|
|
|
026269 |
return -1;
|
|
|
026269 |
}
|
|
|
026269 |
+ /*
|
|
|
026269 |
+ * FIXME: Remapping a couple of error codes and falling through
|
|
|
026269 |
+ * to the LZMA error handling looks fragile.
|
|
|
026269 |
+ */
|
|
|
026269 |
if (ret == Z_MEM_ERROR)
|
|
|
026269 |
ret = LZMA_MEM_ERROR;
|
|
|
026269 |
if (ret == Z_DATA_ERROR)
|
|
|
026269 |
@@ -587,6 +591,11 @@ xz_decomp(xz_statep state)
|
|
|
026269 |
xz_error(state, LZMA_PROG_ERROR, "compression error");
|
|
|
026269 |
return -1;
|
|
|
026269 |
}
|
|
|
026269 |
+ if ((state->how != GZIP) &&
|
|
|
026269 |
+ (ret != LZMA_OK) && (ret != LZMA_STREAM_END)) {
|
|
|
026269 |
+ xz_error(state, ret, "lzma error");
|
|
|
026269 |
+ return -1;
|
|
|
026269 |
+ }
|
|
|
026269 |
} while (strm->avail_out && ret != LZMA_STREAM_END);
|
|
|
026269 |
|
|
|
026269 |
/* update available output and crc check value */
|
|
|
026269 |
--
|
|
|
026269 |
2.22.0
|
|
|
026269 |
|