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| author |   Li RongQing <lirongqing@baidu.com> | 2018-08-03 15:45:21 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-08-05 17:24:45 -0700 |
| commit | a6bcfc89694ed8cb482a82cdc8b93aae63a8b691 (patch) | |
| tree | 5b4432cdf877af3ad989eb12c1d63f481dc89a8b /net/core | |
| parent | ipv6: defrag: drop non-last frags smaller than min mtu (diff) | |
| download | linux-dev-a6bcfc89694ed8cb482a82cdc8b93aae63a8b691.tar.xz linux-dev-a6bcfc89694ed8cb482a82cdc8b93aae63a8b691.zip | |
net: check extack._msg before print
dev_set_mtu_ext is able to fail with a valid mtu value, at that
condition, extack._msg is not set and random since it is in stack,
then kernel will crash when print it.
Fixes: 7a4c53bee3324a ("net: report invalid mtu value via netlink extack")
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 36e994519488..f68122f0ab02 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -7583,8 +7583,9 @@ int dev_set_mtu(struct net_device *dev, int new_mtu) struct netlink_ext_ack extack; int err; + memset(&extack, 0, sizeof(extack)); err = dev_set_mtu_ext(dev, new_mtu, &extack); - if (err) + if (err && extack._msg) net_err_ratelimited("%s: %s\n", dev->name, extack._msg); return err; } |