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Old 12-19-2008, 03:52 PM
Steven Whitehouse
 
Default GFS2: Fix use-after-free bug on umount (try #2)

There were some issues relating to umount hangs with journaled data
with the original patch. I've reverted that, and this patch fixes
the original issue, but without side effects.

>From a95b5b8af40786f6d13e5570e25a6ce8608eb793 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Fri, 19 Dec 2008 15:43:05 +0000
Subject: [PATCH] GFS2: Fix use-after-free bug on umount (try #2)

This should solve the issue with the previous attempt at fixing this.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 4cae60f..f91eebd 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1263,17 +1263,21 @@ static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
static void gfs2_kill_sb(struct super_block *sb)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
- if (sdp) {
- gfs2_meta_syncfs(sdp);
- dput(sdp->sd_root_dir);
- dput(sdp->sd_master_dir);
- sdp->sd_root_dir = NULL;
- sdp->sd_master_dir = NULL;
+
+ if (sdp == NULL) {
+ kill_block_super(sb);
+ return;
}
+
+ gfs2_meta_syncfs(sdp);
+ dput(sdp->sd_root_dir);
+ dput(sdp->sd_master_dir);
+ sdp->sd_root_dir = NULL;
+ sdp->sd_master_dir = NULL;
shrink_dcache_sb(sb);
kill_block_super(sb);
- if (sdp)
- gfs2_delete_debugfs_file(sdp);
+ gfs2_delete_debugfs_file(sdp);
+ kfree(sdp);
}

struct file_system_type gfs2_fs_type = {
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 08837a7..777783d 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -182,7 +182,6 @@ static void gfs2_put_super(struct super_block *sb)

/* At this point, we're through participating in the lockspace */
gfs2_sys_fs_del(sdp);
- kfree(sdp);
}

/**
--
1.6.0.3
 

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