From bd6227a150fdb56e7bb734976ef6e53a2c1cb334 Mon Sep 17 00:00:00 2001
From: Stephan Mueller <smueller@chronox.de>
Date: Thu, 14 Sep 2017 17:10:28 +0200
Subject: [PATCH] crypto: drbg - fix freeing of resources
Git-commit: bd6227a150fdb56e7bb734976ef6e53a2c1cb334
Patch-mainline: v4.14-rc2
References: bsc#1051510

During the change to use aligned buffers, the deallocation code path was
not updated correctly. The current code tries to free the aligned buffer
pointer and not the original buffer pointer as it is supposed to.

Thus, the code is updated to free the original buffer pointer and set
the aligned buffer pointer that is used throughout the code to NULL.

Fixes: 3cfc3b9721123 ("crypto: drbg - use aligned buffers")
Cc: <stable@vger.kernel.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 crypto/drbg.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1133,10 +1133,10 @@ static inline void drbg_dealloc_state(st
 {
 	if (!drbg)
 		return;
-	kzfree(drbg->V);
-	drbg->Vbuf = NULL;
-	kzfree(drbg->C);
-	drbg->Cbuf = NULL;
+	kzfree(drbg->Vbuf);
+	drbg->V = NULL;
+	kzfree(drbg->Cbuf);
+	drbg->C = NULL;
 	kzfree(drbg->scratchpadbuf);
 	drbg->scratchpadbuf = NULL;
 	drbg->reseed_ctr = 0;