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[PATCH] uml: hostfs: fix double free

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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 <wstearns@pobox.com>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2007-03-07 20:41:07 -08:00 committed by Linus Torvalds
parent 0ce3c83a9c
commit bca271136f
1 changed files with 4 additions and 1 deletions
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5
fs/hostfs/hostfs_kern.c
View file

@ -966,6 +966,9 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent)
goto out_put; goto out_put;
HOSTFS_I(root_inode)->host_filename = name; 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; err = -ENOMEM;
sb->s_root = d_alloc_root(root_inode); 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 */ /* No iput in this case because the dput does that for us */
dput(sb->s_root); dput(sb->s_root);
sb->s_root = NULL; sb->s_root = NULL;
goto out_free; goto out;
} }
return(0); return(0);