diff mbox

[v3,09/11] crypto: KEYS: check err on akcipher maxsize

Message ID 1495545545-16872-10-git-send-email-tudor.ambarus@microchip.com (mailing list archive)
State Superseded
Delegated to: Herbert Xu
Headers show

Commit Message

Tudor Ambarus May 23, 2017, 1:19 p.m. UTC 
crypto_akcipher_maxsize() returns minimum length for output buffer
or error code if key hasn't been set. Check for error before
allocating memory.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
 crypto/asymmetric_keys/public_key.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox

Patch

diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
index d3a989e..2b2f8bf 100644
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -123,6 +123,11 @@  int public_key_verify_signature(const struct public_key *pkey,
 
 	ret = -ENOMEM;
 	outlen = crypto_akcipher_maxsize(tfm);
+	if (outlen < 0) {
+		ret = outlen;
+		goto error_free_req;
+	}
+
 	output = kmalloc(outlen, GFP_KERNEL);
 	if (!output)
 		goto error_free_req;