3.16.51-rc1 review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
commit 092c3def24bb68a00ff58c76ed67b9ff448387ce upstream.
The copy_from_user() function returns the number of bytes which we weren't able to copy. We don't want to return that to the user but instead we want to return -EFAULT.
Fixes: d7e09d0397e8 ("staging: add Lustre file system client support") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/drivers/staging/lustre/lustre/obdclass/class_obd.c +++ b/drivers/staging/lustre/lustre/obdclass/class_obd.c @@ -232,8 +232,8 @@ int class_handle_ioctl(unsigned int cmd, OBD_ALLOC(lcfg, data->ioc_plen1); if (lcfg == NULL) GOTO(out, err = -ENOMEM); - err = copy_from_user(lcfg, data->ioc_pbuf1, - data->ioc_plen1); + if (copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1)) + err = -EFAULT; if (!err) err = lustre_cfg_sanity_check(lcfg, data->ioc_plen1); if (!err)