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authorJakub Kicinski <kuba@kernel.org>2023-02-13 22:53:55 -0800
committerDavid S. Miller <davem@davemloft.net>2023-02-15 10:26:37 +0000
commitfda6c89fe3d9aca073495a664e1d5aea28cd4377 (patch)
treeaf875da2b9aeba4d03b196d636052136f1b31804 /net/mpls/af_mpls.c
parent42018a322bd453e38b3ffee294982243e50a484f (diff)
net: mpls: fix stale pointer if allocation fails during device rename
lianhui reports that when MPLS fails to register the sysctl table under new location (during device rename) the old pointers won't get overwritten and may be freed again (double free). Handle this gracefully. The best option would be unregistering the MPLS from the device completely on failure, but unfortunately mpls_ifdown() can fail. So failing fully is also unreliable. Another option is to register the new table first then only remove old one if the new one succeeds. That requires more code, changes order of notifications and two tables may be visible at the same time. sysctl point is not used in the rest of the code - set to NULL on failures and skip unregister if already NULL. Reported-by: lianhui tang <bluetlh@gmail.com> Fixes: 0fae3bf018d9 ("mpls: handle device renames for per-device sysctls") Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls/af_mpls.c')
-rw-r--r--net/mpls/af_mpls.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 35b5f806fdda..dc5165d3eec4 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1428,6 +1428,7 @@ static int mpls_dev_sysctl_register(struct net_device *dev,
free:
kfree(table);
out:
+ mdev->sysctl = NULL;
return -ENOBUFS;
}
@@ -1437,6 +1438,9 @@ static void mpls_dev_sysctl_unregister(struct net_device *dev,
struct net *net = dev_net(dev);
struct ctl_table *table;
+ if (!mdev->sysctl)
+ return;
+
table = mdev->sysctl->ctl_table_arg;
unregister_net_sysctl_table(mdev->sysctl);
kfree(table);