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| author |   Wei Wang <weiwan@google.com> | 2017-08-21 09:47:10 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-08-22 11:03:19 -0700 |
| commit | c5cff8561d2d0006e972bd114afd51f082fee77c (patch) | |
| tree | 590d33658f2a4a6add9db5734988b80a5313efc8 /net/hsr/hsr_device.c | |
| parent | Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec (diff) | |
| download | linux-dev-c5cff8561d2d0006e972bd114afd51f082fee77c.tar.xz linux-dev-c5cff8561d2d0006e972bd114afd51f082fee77c.zip | |
ipv6: add rcu grace period before freeing fib6_node
We currently keep rt->rt6i_node pointing to the fib6_node for the route.
And some functions make use of this pointer to dereference the fib6_node
from rt structure, e.g. rt6_check(). However, as there is neither
refcount nor rcu taken when dereferencing rt->rt6i_node, it could
potentially cause crashes as rt->rt6i_node could be set to NULL by other
CPUs when doing a route deletion.
This patch introduces an rcu grace period before freeing fib6_node and
makes sure the functions that dereference it takes rcu_read_lock().
Note: there is no "Fixes" tag because this bug was there in a very
early stage.
Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/hsr/hsr_device.c')
0 files changed, 0 insertions, 0 deletions