On Fri, Aug 13, 2021 at 12:41 AM Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx> wrote: > > FAN_FS_ERROR will report a file handle, but it is an unhashed event. > Allow passing a NULL hash to fanotify_encode_fh and avoid calculating > the hash if not needed. > > Signed-off-by: Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx> > Reviewed-by: Jan Kara <jack@xxxxxxx> Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx> > --- > fs/notify/fanotify/fanotify.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c > index acf78c0ed219..50fce4fec0d6 100644 > --- a/fs/notify/fanotify/fanotify.c > +++ b/fs/notify/fanotify/fanotify.c > @@ -403,8 +403,12 @@ static int fanotify_encode_fh(struct fanotify_fh *fh, struct inode *inode, > fh->type = type; > fh->len = fh_len; > > - /* Mix fh into event merge key */ > - *hash ^= fanotify_hash_fh(fh); > + /* > + * Mix fh into event merge key. Hash might be NULL in case of > + * unhashed FID events (i.e. FAN_FS_ERROR). > + */ > + if (hash) > + *hash ^= fanotify_hash_fh(fh); > > return FANOTIFY_FH_HDR_LEN + fh_len; > > -- > 2.32.0 >
