Re: [PATCH] jfs: fix shift-out-of-bounds in dbJoin

Manas Ghandat
2023-10-16T15:00:44Z

Just a friendly ping :)

On 11/10/23 20:09, Manas Ghandat wrote:
> Currently while joining the leaf in a buddy system there is shift out
> of bound error in calculation of BUDSIZE. Added the required check
> to the BUDSIZE and fixed the documentation as well.
>
> Reported-by: syzbot+411debe54d318eaed386@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=411debe54d318eaed386
> Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
> ---
> fs/jfs/jfs_dmap.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
> index 6b838d3ae7c2..baa97bda1c7a 100644
> --- a/fs/jfs/jfs_dmap.c
> +++ b/fs/jfs/jfs_dmap.c
> @@ -2730,7 +2730,9 @@ static int dbBackSplit(dmtree_t * tp, int leafno)
> * leafno - the number of the leaf to be updated.
> * newval - the new value for the leaf.
> *
> - * RETURN VALUES: none
> + * RETURN VALUES:
> + * 0 - success
> + * -EIO - i/o error
> */
> static int dbJoin(dmtree_t * tp, int leafno, int newval)
> {
> @@ -2757,6 +2759,10 @@ static int dbJoin(dmtree_t * tp, int leafno, int newval)
> * get the buddy size (number of words covered) of
> * the new value.
> */
> +
> + if ((newval - tp->dmt_budmin) > BUDMIN)
> + return -EIO;
> +
> budsz = BUDSIZE(newval, tp->dmt_budmin);
>
> /* try to join.
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