From: ymf <yangmengfei1394@xxxxxxxxxxxxxx>
We are trying to use kernel ecdsa algorithm to sign something.
When we call the crypto_akcipher_set_priv_key function, the
system collapses because it comes to NULL pointer.We find out
kerenl ecdsa algorithm has not offered the set_priv_key function.
So we think it might be necessary to check whether set_priv_key is
available when crypto_akcipher_set_priv_key is called.
Signed-off-by: ymf <yangmengfei1394@xxxxxxxxxxxxxx>
---
include/crypto/akcipher.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
index f35fd653e4e5..a68f0e23bf89 100644
--- a/include/crypto/akcipher.h
+++ b/include/crypto/akcipher.h
@@ -459,7 +459,9 @@ static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,
unsigned int keylen)
{
struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
-
- return alg->set_priv_key(tfm, key, keylen);
+ if (likely(alg->set_priv_key != NULL))
+ return alg->set_priv_key(tfm, key, keylen);
+ else
+ return -EPERM;
}
#endif
--
2.34.1
