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Miller" Cc: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Tianjia Zhang , Gilad Ben-Yossef , keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] crypto: public_key: check that pkey_algo is non-NULL before passing it to strcmp() Date: Tue, 12 Jan 2021 17:10:44 +0100 Message-Id: <20210112161044.3101-1-toke@redhat.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org When public_key_verify_signature() is called from asymmetric_key_verify_signature(), the pkey_algo field of struct public_key_signature will be NULL, which causes a NULL pointer dereference in the strcmp() check. Fix this by adding a NULL check. One visible manifestation of this is that userspace programs (such as the 'iwd' WiFi daemon) will be killed when trying to verify a TLS key using the keyctl(2) interface. Cc: stable@vger.kernel.org Fixes: 215525639631 ("X.509: support OSCCA SM2-with-SM3 certificate verification") Signed-off-by: Toke Høiland-Jørgensen --- crypto/asymmetric_keys/public_key.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 8892908ad58c..35b09e95a870 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -356,7 +356,7 @@ int public_key_verify_signature(const struct public_key *pkey, if (ret) goto error_free_key; - if (strcmp(sig->pkey_algo, "sm2") == 0 && sig->data_size) { + if (sig->pkey_algo && strcmp(sig->pkey_algo, "sm2") == 0 && sig->data_size) { ret = cert_sig_digest_update(sig, tfm); if (ret) goto error_free_key; -- 2.30.0