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-rw-r--r--net/core/dev_ioctl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index 1d309a666932..1b807d119da5 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -192,7 +192,7 @@ static int net_hwtstamp_validate(struct ifreq *ifr)
if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
return -EFAULT;
- if (cfg.flags) /* reserved for future extensions */
+ if (cfg.flags & ~HWTSTAMP_FLAG_MASK)
return -EINVAL;
tx_type = cfg.tx_type;