From 74da77921333171766031ea213b11f1e650814f9 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 31 Oct 2023 12:51:09 +0300 Subject: net/tcp_sigpool: Fix some off by one bugs The "cpool_populated" variable is the number of elements in the cpool[] array that have been populated. It is incremented in tcp_sigpool_alloc_ahash() every time we populate a new element. Unpopulated elements are NULL but if we have populated every element then this code will read one element beyond the end of the array. Fixes: 8c73b26315aa ("net/tcp: Prepare tcp_md5sig_pool for TCP-AO") Signed-off-by: Dan Carpenter Reviewed-by: Dmitry Safonov Reviewed-by: Eric Dumazet Link: https://lore.kernel.org/r/ce915d61-04bc-44fb-b450-35fcc9fc8831@moroto.mountain Signed-off-by: Jakub Kicinski --- net/ipv4/tcp_sigpool.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'net/ipv4/tcp_sigpool.c') diff --git a/net/ipv4/tcp_sigpool.c b/net/ipv4/tcp_sigpool.c index 65a8eaae2fec..55b310a722c7 100644 --- a/net/ipv4/tcp_sigpool.c +++ b/net/ipv4/tcp_sigpool.c @@ -231,7 +231,7 @@ static void cpool_schedule_cleanup(struct kref *kref) */ void tcp_sigpool_release(unsigned int id) { - if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) + if (WARN_ON_ONCE(id >= cpool_populated || !cpool[id].alg)) return; /* slow-path */ @@ -245,7 +245,7 @@ EXPORT_SYMBOL_GPL(tcp_sigpool_release); */ void tcp_sigpool_get(unsigned int id) { - if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) + if (WARN_ON_ONCE(id >= cpool_populated || !cpool[id].alg)) return; kref_get(&cpool[id].kref); } @@ -256,7 +256,7 @@ int tcp_sigpool_start(unsigned int id, struct tcp_sigpool *c) __cond_acquires(RC struct crypto_ahash *hash; rcu_read_lock_bh(); - if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) { + if (WARN_ON_ONCE(id >= cpool_populated || !cpool[id].alg)) { rcu_read_unlock_bh(); return -EINVAL; } @@ -301,7 +301,7 @@ EXPORT_SYMBOL_GPL(tcp_sigpool_end); */ size_t tcp_sigpool_algo(unsigned int id, char *buf, size_t buf_len) { - if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) + if (WARN_ON_ONCE(id >= cpool_populated || !cpool[id].alg)) return -EINVAL; return strscpy(buf, cpool[id].alg, buf_len); -- cgit v1.2.3