From: Ally Heev <allyheev@gmail.com>
To: David Howells <dhowells@redhat.com>,
Lukas Wunner <lukas@wunner.de>,
Ignat Korchagin <ignat@cloudflare.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>
Cc: keyrings@vger.kernel.org, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org,
Dan Carpenter <dan.carpenter@linaro.org>,
Ally Heev <allyheev@gmail.com>
Subject: [PATCH v2] crypto: asymmetric_keys: fix uninitialized pointers with free attribute
Date: Tue, 11 Nov 2025 19:06:29 +0530 [thread overview]
Message-ID: <20251111-aheev-uninitialized-free-attr-crypto-v2-1-33699a37a3ed@gmail.com> (raw)
Uninitialized pointers with `__free` attribute can cause undefined
behavior as the memory assigned randomly to the pointer is freed
automatically when the pointer goes out of scope.
crypto/asymmetric_keys doesn't have any bugs related to this as of now,
but, it is better to initialize and assign pointers with `__free`
attribute in one statement to ensure proper scope-based cleanup
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/aPiG_F5EBQUjZqsl@stanley.mountain/
Signed-off-by: Ally Heev <allyheev@gmail.com>
---
Changes in v2:
- moved declarations to the top and initialized them with NULL
- Link to v1: https://lore.kernel.org/r/20251105-aheev-uninitialized-free-attr-crypto-v1-1-83da1e10e8c4@gmail.com
---
crypto/asymmetric_keys/x509_cert_parser.c | 2 +-
crypto/asymmetric_keys/x509_public_key.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/crypto/asymmetric_keys/x509_cert_parser.c b/crypto/asymmetric_keys/x509_cert_parser.c
index 8df3fa60a44f80fbd71af17faeca2e92b6cc03ce..b37cae914987b69c996d6559058c00f13c92b5b9 100644
--- a/crypto/asymmetric_keys/x509_cert_parser.c
+++ b/crypto/asymmetric_keys/x509_cert_parser.c
@@ -60,7 +60,7 @@ EXPORT_SYMBOL_GPL(x509_free_certificate);
*/
struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
{
- struct x509_certificate *cert __free(x509_free_certificate);
+ struct x509_certificate *cert __free(x509_free_certificate) = NULL;
struct x509_parse_context *ctx __free(kfree) = NULL;
struct asymmetric_key_id *kid;
long ret;
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index 8409d7d36cb4f3582e15f9ee4d25f302b3b29358..12e3341e806b8db93803325a96a3821fd5d0a9f0 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -148,7 +148,7 @@ int x509_check_for_self_signed(struct x509_certificate *cert)
*/
static int x509_key_preparse(struct key_preparsed_payload *prep)
{
- struct x509_certificate *cert __free(x509_free_certificate);
+ struct x509_certificate *cert __free(x509_free_certificate) = NULL;
struct asymmetric_key_ids *kids __free(kfree) = NULL;
char *p, *desc __free(kfree) = NULL;
const char *q;
---
base-commit: c9cfc122f03711a5124b4aafab3211cf4d35a2ac
change-id: 20251105-aheev-uninitialized-free-attr-crypto-bc94ec1b2253
Best regards,
--
Ally Heev <allyheev@gmail.com>
next reply other threads:[~2025-11-11 13:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-11 13:36 Ally Heev [this message]
2025-11-11 16:08 ` [PATCH v2] crypto: asymmetric_keys: fix uninitialized pointers with free attribute Ignat Korchagin
2025-11-22 3:18 ` Herbert Xu
2025-11-22 14:25 ` Krzysztof Kozlowski
2025-11-22 17:19 ` ally heev
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