diff options
| author | Tianjia Zhang <tianjia.zhang@linux.alibaba.com> | 2021-01-19 00:13:19 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-01-20 11:33:51 -0800 |
| commit | 7178a107f5ea7bdb1cc23073234f0ded0ef90ec7 (patch) | |
| tree | f3228da0199efa9d387e78fb3967ef64e8a03847 /crypto/asymmetric_keys | |
| parent | db58465f1121086b524be80be39d1fedbe5387f3 (diff) | |
| download | lwn-7178a107f5ea7bdb1cc23073234f0ded0ef90ec7.tar.gz lwn-7178a107f5ea7bdb1cc23073234f0ded0ef90ec7.zip | |
X.509: Fix crash caused by NULL pointer
On the following call path, `sig->pkey_algo` is not assigned
in asymmetric_key_verify_signature(), which causes runtime
crash in public_key_verify_signature().
keyctl_pkey_verify
asymmetric_key_verify_signature
verify_signature
public_key_verify_signature
This patch simply check this situation and fixes the crash
caused by NULL pointer.
Fixes: 215525639631 ("X.509: support OSCCA SM2-with-SM3 certificate verification")
Reported-by: Tobias Markus <tobias@markus-regensburg.de>
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-and-tested-by: Toke Høiland-Jørgensen <toke@redhat.com>
Tested-by: João Fonseca <jpedrofonseca@ua.pt>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/asymmetric_keys')
| -rw-r--r-- | crypto/asymmetric_keys/public_key.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 8892908ad58c..788a4ba1e2e7 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -356,7 +356,8 @@ 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; |