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af_key: Fix slab-out-of-bounds in pfkey_compile_policy.

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The sadb_x_sec_len is stored in the unit 'byte divided by eight'.
So we have to multiply this value by eight before we can do
size checks. Otherwise we may get a slab-out-of-bounds when
we memcpy the user sec_ctx.

Fixes: df71837d502 ("[LSM-IPSec]: Security association restriction.")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2017-05-05 07:40:42 +02:00
parent 9b3eb54106
commit d90c902449
1 changed files with 1 additions and 1 deletions
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2
net/key/af_key.c
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@ -3285,7 +3285,7 @@ static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
p += pol->sadb_x_policy_len*8;
sec_ctx = (struct sadb_x_sec_ctx *)p;
if (len < pol->sadb_x_policy_len*8 +
sec_ctx->sadb_x_sec_len) {
sec_ctx->sadb_x_sec_len*8) {
*dir = -EINVAL;
goto out;
}