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author | Daniel Borkmann <dborkman@redhat.com> | 2013-09-07 15:13:20 +0200 |
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committer | David S. Miller <davem@davemloft.net> | 2013-09-11 16:09:59 -0400 |
commit | ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2 (patch) | |
tree | c4bebb0cdc317a32fec9d1eddaf8fa681380e751 /net/sctp | |
parent | 3bf4b5b11d381fed6a94a7e487e01c8b3bc436b9 (diff) | |
download | op-kernel-dev-ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2.zip op-kernel-dev-ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2.tar.gz |
net: fib: fib6_add: fix potential NULL pointer dereference
When the kernel is compiled with CONFIG_IPV6_SUBTREES, and we return
with an error in fn = fib6_add_1(), then error codes are encoded into
the return pointer e.g. ERR_PTR(-ENOENT). In such an error case, we
write the error code into err and jump to out, hence enter the if(err)
condition. Now, if CONFIG_IPV6_SUBTREES is enabled, we check for:
if (pn != fn && pn->leaf == rt)
...
if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO))
...
Since pn is NULL and fn is f.e. ERR_PTR(-ENOENT), then pn != fn
evaluates to true and causes a NULL-pointer dereference on further
checks on pn. Fix it, by setting both NULL in error case, so that
pn != fn already evaluates to false and no further dereference
takes place.
This was first correctly implemented in 4a287eba2 ("IPv6 routing,
NLM_F_* flag support: REPLACE and EXCL flags support, warn about
missing CREATE flag"), but the bug got later on introduced by
188c517a0 ("ipv6: return errno pointers consistently for fib6_add_1()").
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Lin Ming <mlin@ss.pku.edu.cn>
Cc: Matti Vaittinen <matti.vaittinen@nsn.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Matti Vaittinen <matti.vaittinen@nsn.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
0 files changed, 0 insertions, 0 deletions