linux-ext4 - [PATCH 07/37] resize2fs: fix check for collision between old GDT and superblock on sparse

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Date:	Thu, 01 May 2014 16:13:08 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 07/37] resize2fs: fix check for collision between old GDT
 and superblock on sparse_super2 fs

In reserve_sparse_super2_last_group, the old_desc check should only be
performed if ext2fs_super_and_bgd_loc2() gave us a location -- a
return value of 0 means that there is no old-style GDT block.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 resize/resize2fs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index f5f1337..a81a1c3 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -2121,7 +2121,7 @@ static errcode_t reserve_sparse_super2_last_group(ext2_resize_t rfs,
 		      stderr);
 		exit(1);
 	}
-	if (old_desc != sb+1) {
+	if (old_desc && old_desc != sb+1) {
 		fputs(_("Should never happen!  Unexpected old_desc in "
 			"super_sparse bg?\n"),
 		      stderr);

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