From bca271136f06514253aa28c24c04fc23b88e971e Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso Date: Wed, 7 Mar 2007 20:41:07 -0800 Subject: [PATCH] uml: hostfs: fix double free Fix double free in the error path - when name is assigned into root_inode we do not own it any more and we must not kfree() it - see patch for details. Thanks to William Stearns for the initial report. CC: William Stearns Signed-off-by: Paolo 'Blaisorblade' Giarrusso Acked-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/hostfs/hostfs_kern.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'fs/hostfs') diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c index e965eb11d76f..6f10e43746f9 100644 --- a/fs/hostfs/hostfs_kern.c +++ b/fs/hostfs/hostfs_kern.c @@ -966,6 +966,9 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) goto out_put; HOSTFS_I(root_inode)->host_filename = name; + /* Avoid that in the error path, iput(root_inode) frees again name through + * hostfs_destroy_inode! */ + name = NULL; err = -ENOMEM; sb->s_root = d_alloc_root(root_inode); @@ -977,7 +980,7 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) /* No iput in this case because the dput does that for us */ dput(sb->s_root); sb->s_root = NULL; - goto out_free; + goto out; } return(0); -- cgit v1.2.2