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SubjectRe: [PATCH] udf: fix an uninitialized read bug
Thanks for your prompt reply, Jan! I will rework the patch.

Best regards,
Wenwen

On Mon, Apr 15, 2019 at 11:05 AM Jan Kara <jack@suse.cz> wrote:
>
> On Mon 15-04-19 10:26:24, Wenwen Wang wrote:
> > In udf_lookup(), the pointer 'fi' is a local variable initialized by the
> > return value of the function call udf_find_entry(). However, if the macro
> > 'UDF_RECOVERY' is defined, this variable will become uninitialized if the
> > else branch is not taken, which can potentially cause incorrect results in
> > the following execution.
> >
> > This patch simply initializes this local pointer to NULL.
> >
> > Signed-off-by: Wenwen Wang <wang6495@umn.edu>
>
> Thanks for the patch! A better fix is to drop the whole UDF_RECOVERY ifdef
> and what's in it. It is just dead code anyway.
>
> Honza
>
> > ---
> > fs/udf/namei.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/udf/namei.c b/fs/udf/namei.c
> > index 58cc241..9d499e1 100644
> > --- a/fs/udf/namei.c
> > +++ b/fs/udf/namei.c
> > @@ -299,7 +299,7 @@ static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
> > struct inode *inode = NULL;
> > struct fileIdentDesc cfi;
> > struct udf_fileident_bh fibh;
> > - struct fileIdentDesc *fi;
> > + struct fileIdentDesc *fi = NULL;
> >
> > if (dentry->d_name.len > UDF_NAME_LEN)
> > return ERR_PTR(-ENAMETOOLONG);
> > --
> > 2.7.4
> >
> >
> --
> Jan Kara <jack@suse.com>
> SUSE Labs, CR

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