| Message ID | 163546.1611015033@warthog.procyon.org.uk |
|---|---|
| State | Accepted |
| Commit | 7178a107f5ea7bdb1cc23073234f0ded0ef90ec7 |
| Headers | show |
| Series |
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| Related | show |
On Tue, Jan 19, 2021 at 12:10:33AM +0000, David Howells wrote: > > From: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> > > 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> > Cc: stable@vger.kernel.org # v5.10+ > --- For what it's worth Acked-by: Jarkko Sakkinen <jarkko@kernel.org> /Jarkko > > crypto/asymmetric_keys/public_key.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > 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; > >
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;