Thread (8 messages) read the whole thread 8 messages, 4 authors, 2017-06-23

Re: [PATCH -net] tls: return -EFAULT if copy_to_user() fails

From: Dave Watson <hidden>
Date: 2017-06-23 16:12:24
Also in: kernel-janitors

On 06/23/17 01:15 PM, Dan Carpenter wrote:
The copy_to_user() function returns the number of bytes remaining but we
want to return -EFAULT here.

Fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Dan Carpenter <redacted>
Acked-by: Dave Watson <redacted>

Yes, -EFAULT seems like the correct choice here, the return from
copy_to_user isn't useful.  Thanks
quoted hunk ↗ jump to hunk
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 2ebc328bda96..a03130a47b85 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -273,7 +273,8 @@ static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 	}
 
 	if (len == sizeof(crypto_info)) {
-		rc = copy_to_user(optval, crypto_info, sizeof(*crypto_info));
+		if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
+			rc = -EFAULT;
 		goto out;
 	}
 
@@ -293,9 +294,10 @@ static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
 		memcpy(crypto_info_aes_gcm_128->iv, ctx->iv,
 		       TLS_CIPHER_AES_GCM_128_IV_SIZE);
 		release_sock(sk);
-		rc = copy_to_user(optval,
-				  crypto_info_aes_gcm_128,
-				  sizeof(*crypto_info_aes_gcm_128));
+		if (copy_to_user(optval,
+				 crypto_info_aes_gcm_128,
+				 sizeof(*crypto_info_aes_gcm_128)))
+			rc = -EFAULT;
 		break;
 	}
 	default:
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