Cong Wang afbc293add af_key: relax availability checks for skb size calculation ... xfrm_probe_algs() probes kernel crypto modules and changes the availability of struct xfrm_algo_desc. But there is a small window where ealg->available and aalg->available get changed between count_ah_combs()/count_esp_combs() and dump_ah_combs()/dump_esp_combs(), in this case we may allocate a smaller skb but later put a larger amount of data and trigger the panic in skb_put(). Fix this by relaxing the checks when counting the size, that is, skipping the test of ->available. We may waste some memory for a few of sizeof(struct sadb_comb), but it is still much better than a panic. Reported-by: syzbot+b2bf2652983d23734c5c@syzkaller.appspotmail.com Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>		2021-01-04 10:05:50 +01:00
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af_key.c	af_key: relax availability checks for skb size calculation	2021-01-04 10:05:50 +01:00
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