crypto: rk3288 - Fix use after free in unprepare

The unprepare call must be carried out before the finalize call
as the latter can free the request.

Fixes: c66c17a0f69b ("crypto: rk3288 - Remove prepare/unprepare request")
Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/rockchip/rk3288_crypto_ahash.c b/drivers/crypto/rockchip/rk3288_crypto_ahash.c
index 1b13b4aa16ecc441a37266996f1b4aca6863a436..a235e6c300f1e5419eb06945757946ced70f12e2 100644 (file)
--- a/drivers/crypto/rockchip/rk3288_crypto_ahash.c
+++ b/drivers/crypto/rockchip/rk3288_crypto_ahash.c
@@ -332,12 +332,12 @@ static int rk_hash_run(struct crypto_engine *engine, void *breq)
 theend:
        pm_runtime_put_autosuspend(rkc->dev);
 
+       rk_hash_unprepare(engine, breq);
+
        local_bh_disable();
        crypto_finalize_hash_request(engine, breq, err);
        local_bh_enable();
 
-       rk_hash_unprepare(engine, breq);
-
        return 0;
 }