linux-ext4 - [PATCH] debugfs - fix segfault on "stat" command with no open fs

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Date:	Thu, 29 Jan 2009 17:46:28 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
CC:	Andrew Hecox <ahecox@...hat.com>
Subject: [PATCH] debugfs - fix segfault on "stat" command with no open fs

This is a regression from commit 
8fdf29117f922419bd5b3f741e5d554b1d5b8893, which attempts to access
current_fs via a feature check before we check that it's open.

Just moving the feature check below the open check should fix it.

Reported-by: Andrew Hecox <ahecox@...hat.com>
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---

Index: e2fsprogs/debugfs/debugfs.c
===================================================================
--- e2fsprogs.orig/debugfs/debugfs.c	2008-09-12 10:37:52.000000000 -0500
+++ e2fsprogs/debugfs/debugfs.c	2009-01-29 16:36:04.748574864 -0600
@@ -291,9 +291,6 @@ void do_show_super_stats(int argc, char 
 	int	c, header_only = 0;
 	int	numdirs = 0, first, gdt_csum;
 
-	gdt_csum = EXT2_HAS_RO_COMPAT_FEATURE(current_fs->super,
-					      EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
-
 	reset_getopt();
 	while ((c = getopt (argc, argv, "h")) != EOF) {
 		switch (c) {
@@ -321,6 +318,8 @@ void do_show_super_stats(int argc, char 
 		return;
 	}
 
+	gdt_csum = EXT2_HAS_RO_COMPAT_FEATURE(current_fs->super,
+					      EXT4_FEATURE_RO_COMPAT_GDT_CSUM);
 	gdp = &current_fs->group_desc[0];
 	for (i = 0; i < current_fs->group_desc_count; i++, gdp++) {
 		fprintf(out, " Group %2d: block bitmap at %u, "

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