releases/4.9.10/crypto-algif_aead-fix-kernel-panic-on-list_del.patch

From 0b529f143e8baad441a5aac9ad55ec2434d8fb46 Mon Sep 17 00:00:00 2001
From: Harsh Jain <harsh@chelsio.com>
Date: Wed, 1 Feb 2017 21:10:28 +0530
Subject: crypto: algif_aead - Fix kernel panic on list_del
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From: Harsh Jain <harsh@chelsio.com>

commit 0b529f143e8baad441a5aac9ad55ec2434d8fb46 upstream.

Kernel panics when userspace program try to access AEAD interface.
Remove node from Linked List before freeing its memory.

Signed-off-by: Harsh Jain <harsh@chelsio.com>
Reviewed-by: Stephan Müller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 crypto/algif_aead.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/crypto/algif_aead.c
+++ b/crypto/algif_aead.c
@@ -671,9 +671,9 @@ static int aead_recvmsg_sync(struct sock
 unlock:
 	list_for_each_entry_safe(rsgl, tmp, &ctx->list, list) {
 		af_alg_free_sg(&rsgl->sgl);
+		list_del(&rsgl->list);
 		if (rsgl != &ctx->first_rsgl)
 			sock_kfree_s(sk, rsgl, sizeof(*rsgl));
-		list_del(&rsgl->list);
 	}
 	INIT_LIST_HEAD(&ctx->list);
 	aead_wmem_wakeup(sk);