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crypto: sm2 - Fix crash caused by uninitialized context

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commit 21155620fb upstream.

In sm2_compute_z_digest() function, the newly allocated structure
mpi_ec_ctx is used, but forget to initialize it, which will cause
a crash when performing subsequent operations.

Fixes: e5221fa6a3 ("KEYS: asymmetric: Move sm2 code into x509_public_key")
Cc: stable@vger.kernel.org # v6.5
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tianjia Zhang 2023-09-18 16:38:50 +08:00 committed by Greg Kroah-Hartman
parent 28df4646ad
commit 3eb82c2bd4
1 changed files with 5 additions and 1 deletions
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6
crypto/sm2.c
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@ -278,10 +278,14 @@ int sm2_compute_z_digest(struct shash_desc *desc,
if (!ec)
return -ENOMEM;
err = __sm2_set_pub_key(ec, key, keylen);
err = sm2_ec_ctx_init(ec);
if (err)
goto out_free_ec;
err = __sm2_set_pub_key(ec, key, keylen);
if (err)
goto out_deinit_ec;
bits_len = SM2_DEFAULT_USERID_LEN * 8;
entl[0] = bits_len >> 8;
entl[1] = bits_len & 0xff;