From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 4 Oct 2011 03:47:19 +0000 (-0400)
Subject: libext2fs: fix bad cast which causes problems for file systems > 512EB
X-Git-Tag: android-x86-6.0-r1~26^2~612
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=00ea586fb23f88da616c27d66faf210532c12b5a;p=android-x86%2Fexternal-e2fsprogs.git

libext2fs: fix bad cast which causes problems for file systems > 512EB

If the number of block groups exceeds 2**32, a bad cast would lead to
a bogus "Not enough space to build proposed filesystem while setting
up superblock" failure.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
index 2875f97e..b050a0a9 100644
--- a/lib/ext2fs/initialize.c
+++ b/lib/ext2fs/initialize.c
@@ -248,7 +248,7 @@ errcode_t ext2fs_initialize(const char *name, int flags,
 	}
 
 retry:
-	fs->group_desc_count = (blk_t) ext2fs_div64_ceil(
+	fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
 		ext2fs_blocks_count(super) - super->s_first_data_block,
 		EXT2_BLOCKS_PER_GROUP(super));
 	if (fs->group_desc_count == 0) {