4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
commit e68368aed56324e2e38d4f6b044bb8cf82077fc2 upstream.
public_key_verify_signature() was passing the CRYPTO_TFM_REQ_MAY_BACKLOG
flag to akcipher_request_set_callback() but was not handling correctly
the case where a -EBUSY error could be returned from the call to
crypto_akcipher_verify() if backlog was used, possibly casuing
data corruption due to use-after-free of buffers.
Resolve this by handling -EBUSY correctly.
Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
crypto/asymmetric_keys/public_key.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/crypto/asymmetric_keys/public_key.c
+++ b/crypto/asymmetric_keys/public_key.c
@@ -140,7 +140,7 @@ int public_key_verify_signature(const st
* signature and returns that to us.
*/
ret = crypto_akcipher_verify(req);
- if (ret == -EINPROGRESS) {
+ if ((ret == -EINPROGRESS) || (ret == -EBUSY)) {
wait_for_completion(&compl.completion);
ret = compl.err;
}