From e7fe0585ca8793e2d43c57e77d4ca79042806acf Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 22 Mar 2010 20:11:53 -0400 Subject: [PATCH] fix do_emergency_remount()/umount() races need list_for_each_entry_safe() here. Original didn't even have restart logics, so if you race with umount() it blew up. Signed-off-by: Al Viro --- fs/super.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/super.c b/fs/super.c index ccb2b5fa89b..4df8233dfb6 100644 --- a/fs/super.c +++ b/fs/super.c @@ -602,10 +602,10 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) static void do_emergency_remount(struct work_struct *work) { - struct super_block *sb; + struct super_block *sb, *n; spin_lock(&sb_lock); - list_for_each_entry(sb, &super_blocks, s_list) { + list_for_each_entry_safe(sb, n, &super_blocks, s_list) { if (list_empty(&sb->s_instances)) continue; sb->s_count++; @@ -618,8 +618,8 @@ static void do_emergency_remount(struct work_struct *work) do_remount_sb(sb, MS_RDONLY, NULL, 1); } up_write(&sb->s_umount); - put_super(sb); spin_lock(&sb_lock); + __put_super(sb); } spin_unlock(&sb_lock); kfree(work); -- 2.20.1