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SubjectRe: [PATCH] jfs : fix array-index-out-of-bounds in diWrite
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Just a friendly ping :)

On 08/10/23 23:17, Manas Ghandat wrote:
> Currently while copying dtree root from inode to dnode in the xp slot
> there is a out of bound memcpy. Added a bound check to the memcpy.
>
> Reported-by: syzbot+c1056fdfe414463fdb33@syzkaller.appspotmail.com
> Fixes: https://syzkaller.appspot.com/bug?extid=c1056fdfe414463fdb33
> Signed-off-by: Manas Ghandat <ghandatmanas@gmail.com>
> ---
> fs/jfs/jfs_imap.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
> index 799d3837e7c2..d1f897848be0 100644
> --- a/fs/jfs/jfs_imap.c
> +++ b/fs/jfs/jfs_imap.c
> @@ -746,7 +746,8 @@ int diWrite(tid_t tid, struct inode *ip)
> xp = (dtpage_t *) & dp->di_dtroot;
> lv = ilinelock->lv;
> for (n = 0; n < ilinelock->index; n++, lv++) {
> - memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
> + if (lv->offset < 128)
> + memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
> lv->length << L2DTSLOTSIZE);
> }
> } else {

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