zziplib/CVE-2018-7725.patch

49 lines
1.5 KiB
Diff

From 1ba660b3300d67b8ce9f6b96bbae0b36fa2d6b06 Mon Sep 17 00:00:00 2001
From: Guido Draheim <guidod@gmx.de>
Date: Tue, 13 Mar 2018 01:29:44 +0100
Subject: [PATCH] check zlib space to be within buffer #39
---
zzip/memdisk.c | 9 +++++++++
zzip/mmapped.c | 2 ++
2 files changed, 11 insertions(+)
diff --git a/zzip/memdisk.c b/zzip/memdisk.c
index 3de201c..8d5743d 100644
--- a/zzip/memdisk.c
+++ b/zzip/memdisk.c
@@ -521,11 +521,20 @@ zzip_mem_entry_fopen(ZZIP_MEM_DISK * dir, ZZIP_MEM_ENTRY * entry)
file->zlib.avail_in = zzip_mem_entry_csize(entry);
file->zlib.next_in = zzip_mem_entry_to_data(entry);
+ debug2("compressed size %i", (int) file->zlib.avail_in);
+ if (file->zlib.next_in + file->zlib.avail_in >= file->endbuf)
+ goto error;
+ if (file->zlib.next_in < file->buffer)
+ goto error;
+
if (! zzip_mem_entry_data_deflated(entry) ||
inflateInit2(&file->zlib, -MAX_WBITS) != Z_OK)
{ free (file); return 0; }
return file;
+error:
+ errno = EBADMSG;
+ return NULL;
}
zzip__new__ ZZIP_MEM_DISK_FILE *
diff --git a/zzip/mmapped.c b/zzip/mmapped.c
index 920c4df..8af18f4 100644
--- a/zzip/mmapped.c
+++ b/zzip/mmapped.c
@@ -654,6 +654,8 @@ zzip_disk_entry_fopen(ZZIP_DISK * disk, ZZIP_DISK_ENTRY * entry)
DBG2("compressed size %i", (int) file->zlib.avail_in);
if (file->zlib.next_in + file->zlib.avail_in >= disk->endbuf)
goto error;
+ if (file->zlib.next_in < disk->buffer)
+ goto error;
if (! zzip_file_header_data_deflated(header))
goto error;