From 0d9e699d3421b5db83eb0cb7a708882440ee78ef Mon Sep 17 00:00:00 2001 From: Simon Horman Date: Mon, 8 Jul 2024 08:27:19 +0100 Subject: net: tls: Pass union tls_crypto_context pointer to memzero_explicit Pass union tls_crypto_context pointer, rather than struct tls_crypto_info pointer, to memzero_explicit(). The address of the pointer is the same before and after. But the new construct means that the size of the dereferenced pointer type matches the size being zeroed. Which aids static analysis. As reported by Smatch: .../tls_main.c:842 do_tls_setsockopt_conf() error: memzero_explicit() 'crypto_info' too small (4 vs 56) No functional change intended. Compile tested only. Reviewed-by: Przemek Kitszel Signed-off-by: Simon Horman Link: https://patch.msgid.link/20240708-tls-memzero-v2-1-9694eaf31b79@kernel.org Signed-off-by: Jakub Kicinski --- net/tls/tls_main.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'net/tls') diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c index 90b7f253d363..6b4b9f2749a6 100644 --- a/net/tls/tls_main.c +++ b/net/tls/tls_main.c @@ -616,6 +616,7 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval, struct tls_crypto_info *alt_crypto_info; struct tls_context *ctx = tls_get_ctx(sk); const struct tls_cipher_desc *cipher_desc; + union tls_crypto_context *crypto_ctx; int rc = 0; int conf; @@ -623,13 +624,15 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval, return -EINVAL; if (tx) { - crypto_info = &ctx->crypto_send.info; + crypto_ctx = &ctx->crypto_send; alt_crypto_info = &ctx->crypto_recv.info; } else { - crypto_info = &ctx->crypto_recv.info; + crypto_ctx = &ctx->crypto_recv; alt_crypto_info = &ctx->crypto_send.info; } + crypto_info = &crypto_ctx->info; + /* Currently we don't support set crypto info more than one time */ if (TLS_CRYPTO_INFO_READY(crypto_info)) return -EBUSY; @@ -710,7 +713,7 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval, return 0; err_crypto_info: - memzero_explicit(crypto_info, sizeof(union tls_crypto_context)); + memzero_explicit(crypto_ctx, sizeof(*crypto_ctx)); return rc; } -- cgit v1.2.3-58-ga151