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authorDi Zhu <zhudi21@huawei.com>2020-10-21 10:00:53 +0800
committerJakub Kicinski <kuba@kernel.org>2020-10-21 18:24:08 -0700
commitebfe3c5183733f784264450a41646a482f964e5e (patch)
treebd86f2a5823a70d137f0aec26d196d9f3fe0dfbf /include
parent5403caf21648d739bf2b1266c33e34384c313379 (diff)
rtnetlink: fix data overflow in rtnl_calcit()
"ip addr show" command execute error when we have a physical network card with a large number of VFs The return value of if_nlmsg_size() in rtnl_calcit() will exceed range of u16 data type when any network cards has a larger number of VFs. rtnl_vfinfo_size() will significant increase needed dump size when the value of num_vfs is larger. Eventually we get a wrong value of min_ifinfo_dump_size because of overflow which decides the memory size needed by netlink dump and netlink_dump() will return -EMSGSIZE because of not enough memory was allocated. So fix it by promoting min_dump_alloc data type to u32 to avoid whole netlink message size overflow and it's also align with the data type of struct netlink_callback{}.min_dump_alloc which is assigned by return value of rtnl_calcit() Signed-off-by: Di Zhu <zhudi21@huawei.com> Link: https://lore.kernel.org/r/20201021020053.1401-1-zhudi21@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/netlink.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 666cd0390699..9f118771e248 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -240,7 +240,7 @@ struct netlink_dump_control {
int (*done)(struct netlink_callback *);
void *data;
struct module *module;
- u16 min_dump_alloc;
+ u32 min_dump_alloc;
};
int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,