[PATCH bpf-next 2/4] bpf: crypto: make state and IV dynptr nullable

[Vadim Fedorenko <vadfed@meta.com>]

Some ciphers do not require state and IV buffer, but with current
implementation 0-sized dynptr is always needed. With adjustment to
verifier we can provide NULL instead of 0-sized dynptr. Make crypto
kfuncs ready for this.

Signed-off-by: Vadim Fedorenko <vadfed@meta.com>
---
 kernel/bpf/crypto.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/bpf/crypto.c b/kernel/bpf/crypto.c
index 2bee4af91e38..4f4446c34b3c 100644
--- a/kernel/bpf/crypto.c
+++ b/kernel/bpf/crypto.c
@@ -275,7 +275,7 @@ static int bpf_crypto_crypt(const struct bpf_crypto_ctx *ctx,
 	if (__bpf_dynptr_is_rdonly(dst))
 		return -EINVAL;
 
-	siv_len = __bpf_dynptr_size(siv);
+	siv_len = siv ? __bpf_dynptr_size(siv) : 0;
 	src_len = __bpf_dynptr_size(src);
 	dst_len = __bpf_dynptr_size(dst);
 	if (!src_len || !dst_len)
@@ -313,9 +313,9 @@ static int bpf_crypto_crypt(const struct bpf_crypto_ctx *ctx,
 __bpf_kfunc int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx,
 				   const struct bpf_dynptr_kern *src,
 				   const struct bpf_dynptr_kern *dst,
-				   const struct bpf_dynptr_kern *siv)
+				   const struct bpf_dynptr_kern *siv__nullable)
 {
-	return bpf_crypto_crypt(ctx, src, dst, siv, true);
+	return bpf_crypto_crypt(ctx, src, dst, siv__nullable, true);
 }
 
 /**
@@ -330,9 +330,9 @@ __bpf_kfunc int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx,
 __bpf_kfunc int bpf_crypto_encrypt(struct bpf_crypto_ctx *ctx,
 				   const struct bpf_dynptr_kern *src,
 				   const struct bpf_dynptr_kern *dst,
-				   const struct bpf_dynptr_kern *siv)
+				   const struct bpf_dynptr_kern *siv__nullable)
 {
-	return bpf_crypto_crypt(ctx, src, dst, siv, false);
+	return bpf_crypto_crypt(ctx, src, dst, siv__nullable, false);
 }
 
 __bpf_kfunc_end_defs();
-- 
2.43.0